ColleCtion 2014
INDEX SUPER GRIP SOLE -13 For daily use in medicine, kitchens and the gastronomy sector REPLACEABLE FOOTBED 14-17 The perfect companion for hard-working feet PU PRODUCTS 18-31 Stepping out in comfort in the food industry, medicine,garden and leisure ESD PRODUCTS 32-39 Safe protection in ESD environments 40-49 Relaxation before, during and after work JOLLY-CLOGS 50-55 Trendy clogs for garden and leisure KNEE PROTECTION 56-59 Optimal mobility and improved comfort in wear 2
professional Occupational safety Comfortable footwear combined with professional expertise is the benchmark for BIRKENSTOCK Professional. What should a work shoe be like? Comfortable! That is the most important feature of a shoe, according to people who spend long working days on their feet. Safe! This is the answer we get to the same question from employers, industry associations and insurance companies. The sandals and clogs from BIRKENSTOCK Professional satisfy both of these requirements in a unique way. All our models have been tested by TÜV Rheinland and thus guarantee the ultimate in safety. 3
01 SUPER GRIP SOLE For daily use in MEDICINE, KITChens and THE gastronomy SECtor Precisely in the medical, kitchen and gastronomy sectors, being able to trust one s equipment is paramount. To guarantee this, BIRKENSTOCK Professional has developed models with the super-grip sole which, thanks to its special design with highly elastic layers, offers additional comfort. The EVA insole automatically compensates for uneven surfaces, whilst the anti-slip, oil and grease-resistant rubber outer sole fulfils the regulatory requirements of EN ISO 13287; 2012.
The super grip sole consists of two components: a heavily cushioned intermediate sole made of EVA (ethylene vinyl acetate) and an anti-slip rubber outer sole tested in accordance with EN ISO 13287:2012. The outer sole is also particularly resistant to oil and grease. The super-grip sole is ideal for daily use in hospitals, kitchens and the gastronomy sector. Suede lining Upper jute layer Cork latex core Lower jute layer For particularly demanding specifications, a two-component sole has been added to the original BIRKENSTOCK footbed. EVA sole 6 SupeR GRIP SOLE
SUPER GRIP SOLE 01 01 Boston SL n 060 134 s 060 136 White Leather Boston SL n 060 194 s 060 196 Leather Tokio SL n 061 134 s 061 136 White Leather Tokio SL n 061 154 s 061 156 Blue Leather 05 05 Tokio SL n 061 194 s 061 196 Leather SupeR GRIP SOLE 7
01 Tokio SL s583 376 Variety White 01 Tokio SL s 061 356 Summer Night Blue Tokio SL s 583 356 Jazzed Up Blue Philadelphia SL n 582 474 s 582 476 White Leather 36-48 05 05 Philadelphia SL n582 484 s 582 486 Grey Leather 36-48 06 06 Philadelphia SL n 582 454 s 582 456 Leather 36-48 8 SupeR GRIP SOLE
SUPER GRIP SOLE Fold-down back-strap Our models Marokko SL, Philadelphia SL and Kay can be worn with the back- strap folded down or as slipper version. 01 01 Philadelphia SL s 582 496 Red Leather Philadelphia SL s 582 436 Nu Farm Red Philadelphia SL s 582 506 Delicate Apple nnormal feet snarrow feet SupeR GRIP SOLE 9
01 01 Philadelphia SL s 582 446 Grey Branches philadelphia SL s 582 376 Variety White philadelphia SL s 582 386 Accepted Yellow philadelphia SL s 582 356 Jazzed Up Blue 05 05 philadelphia SL s 582 396 Babelfish Brown 10 SupeR GRIP SOLE
SUPER GRIP SOLE 01 01 kay SL s 582 516 Cat Red 35-42 kay SL s 582 536 Dog Blue 35-42 kay SL s 582 546 Horse Green 35-42 SupeR GRIP SOLE 11
01 01 Marokko SL s 106 683 Accepted Yellow Marokko SL s 106 693 Babelfish Brown Marokko SL s 106 723 Nu Farm Red Marokko SL s 106 763 Summer Night Blue 05 Marokko SL s 106 733 Patton 05 12 SupeR GRIP SOLE
SUPER GRIP SOLE 01 Marokko SL s 106 753 White 01 Marokko SL s 106 743 linz SL n 583 174 s 583 176 White Leather n 36-46 s linz SL n 583 184 s 583 186 Leather n 36-46 s nnormal feet snarrow feet SupeR GRIP SOLE 13
REPLACEABLE FOOTBEDS The perfect companion for hardworking feet In many occupations, closed-toe shoes or sandals with heel straps are obligatory. This is the only way to ensure that shoes stay where they are supposed to without slipping. For information on what to consider when purchasing shoes for use in the kitchen, catering and gastronomy sectors, staff should consult their employers or corresponding professional association. 15
Replaceable Our new models Portland, Durban and Bradford have a replaceable cork footbed and an anti-slip sole tested by TÜV in accordance with EN ISO 13287:2012. The soles are resistant to oil and grease, making 01 them the ideal accompaniment for daily use in hotels, catering, canteens, hospitals, medical facilities, laboratories and leisure activities. 01 cork replacement footbed for Durban, Bradford and Portland Suede leather lining n 018 801 s018 8 n 40-46 s 16 Replaceable footbeds
01 01 Bradford n592 801 s 592 8 White Leather n 40-46 s REPLACEABLE FOOTBEDS Bradford n592 811 s 592 813 Leather n 40-46 s Durban n599 801 s 599 8 White Leather n 40-46 s Durban n599 811 s 599 813 Leather n 40-46 s 05 Portland n582 401 s 582 4 White Leather n 40-46 s 05 06 Portland n582 421 s 582 423 Leather n 40-46 s 06 nnormal feet snarrow feet Replaceable footbeds 17
PU PRODUCTS Stepping out in comfort in THE food industry, medicine, garden and leisure BIRKENSTOCK Professional clogs are equipped to meet a wide range of requirements. The Safe & Clean models have been specifically designed for the food industry, kitchens and the medical sector and can be washed and disinfected at up to 60 C. The PU clogs are the perfect companion for garden and leisure. Available in a variety of colours, they also make feet look great.
A 640 WITH STEEL TOE CAP All-round protection for feet and toes The PU clogs, with or without steel toecaps, are a popular accessory for everyday work in the catering and food industries. They come with a replaceable, anatomically formed cork footbed and can be washed and disinfected at temperatures up to 60 C. 01 (Cork footbed washable at 30 degrees. Please remove beforehand.) Certified safety in accordance with: A 630: EN ISO 247:2012 SRC, OB A 640: EN ISO 245:2011 SRC, SB E 01 cork replacement footbed for A 630 und A 640 Suede leather lining n 018 852 36-47 20 PU PRODUCTS
01 A 630 without steel toe cap n010 292 White ALPRO Foam 36-47 01 A 640 with steel toe cap n0 292 White 36-47 a 630 without steel toe cap n010 262 Green ALPRO Foam 36-47 A 640 with steel toe cap n0 262 Green 36-47 PU PRODUCTS a 630 without steel toe cap n010 282 Brown ALPRO Foam 36-47 a 630 without steel toe cap n010 252 Blue ALPRO Foam 36-47 A 640 with steel toe cap n0 252 Blue 36-47 05 05 a 630 without steel toe cap n010 272 ALPRO Foam 36-47 A 640 with steel toe cap n0 272 36-47 PU PRODUCTS 21
01 01 active-birki n068 351 s068 353 Orange /Rubber n 39-46 s 35-42 active-birki n068 251 s068 253 Loden /Rubber n 39-46 s 35-42 active-birki n068 671 s068 673 Navy /Rubber n 39-46 s 35-42 active-birki n068 261 s068 263 Steel Gray /Rubber n 39-46 s 35-42 05 05 active-birki n068 381 s068 383 /Rubber n 39-46 s 35-42 06 06 cork replacement footbed for Active-Birki Acrylic Fabric n5 061 s5 063 n 39-46 s 35-42 22 PU PRODUCTS
01 01 Profi-Birki n074 1 White profi-birki n074 571 Raspberry Sorbet 35-43 PU PRODUCTS profi-birki n074 061 Brown profi-birki n074 071 Blue 05 05 profi-birki n074 581 Steel Gray 06 06 profi-birki n074 011 Profi-Birkis and active birkis are certified according to: EN ISO 247:2012 PU PRODUCTS 23
01 Profi-Birki n073 221 Steel Gray Metal 01 profi-birki n074 081 Skull pu replacement footbed for Profi-Birki fleece n5 501 Super-Birki n068 1 White 05 05 Super-Birki n068 1 Yellow 06 06 Super-Birki n068 1 Red 24 PU PRODUCTS
01 01 Super-Birki n068 501 Ciel Light Blue 35-43 Super-Birki n068 651 Raspberry Sorbet 35-43 PU PRODUCTS Super-Birki n068 081 Apple Green Super-Birki n068 051 Green 05 Super-Birki n068 061 Brown 05 06 Super-Birki n068 071 Blue 06 PU PRODUCTS 25
01 01 Super-Birki n068 661 Steel Gray Super-Birki n068 011 Super-Birki n068 761 White Snake 35-43 Super-Birki n068 681 Green Camouflage 05 Super-Birki n068 691 Steel Gray Metal 05 06 Super-Birki n068 611 Skull 06 26 PU PRODUCTS
01 Super-Birki n068 591 Yellow Flower 35-43 01 Super-Birki n068 601 Ciel Blue Flower 35-43 PU PRODUCTS Super-Birki n068 741 Light Green Paisley 35-43 Super-Birki n068 751 Blue Paisley 35-43 05 05 Super-Birki n068 711 Ciel Blue Butterfly 35-43 06 06 Super-Birki n068 731 Red Butterfly 35-43 PU PRODUCTS 27
01 Super-Birki n068 631 Cat Red 35-43 01 Super-Birki n068 771 Horse Apple Green 35-43 Super-Birki n068 781 Dog Ciel Blue 35-43 cork replacement footbed for Super-Birki Acrylic Fabric n 5 500 Easy-care patterned clogs Please note the following care advice to ensure you keep enjoying your patterned clogs for a long time. Clean your clogs by hand and then let them dry well in the open air. Do not wash your clogs in the washing machine or use harsh cleaning products. If you do this, your patterned clogs will continue to look like new! 28 PU PRODUCTS
EN ISO standards In the late 1990s, uniform standards for safety, protective and occupational footwear were established at the European level. They still determine the applicable standards in this area to this day. The technical services provider TÜV Rheinland tests our BIRKENSTOCK Professional models against the following standards: EN ISO 244: Specifications and test procedure EN ISO 245: Specifications for safety shoes EN ISO 246: Specifications for protective shoes EN ISO 247: Specifications for occupational shoes All shoes are described as occupational shoes if they have slip-resistant, antistatic or similar characteristics and generally do not have special toe protection. Models with toe protection are divided into two categories: protective shoes (plastic toecap, impact energy of up to 100 joules) and safety shoes (steel toecap, impact energy of up to 200 joules). Our soles have been tested by TÜV Rheinland and must meet the standards for one of the following categories: PU PRODUCTS SRA Slip resistance on ceramic tiles with detergent SRB Slip resistance on steel floor with glycerine SRC Slip resistance on ceramic tiles with detergent and on steel floor with glycerine Checklist for PU products Below is a quick overview of all the advantages offered by our PU clogs: A 630 A 640 Profi-Birki Active-Birki Super-Birki Super-Birki antistatik Birki-Air antistatik Klassik-Birki antistatik with steel toecap - - - - - - - TÜV certified - - - TÜV tested Slip-resistant - - Alkali-resistant Oil- and grease-resistant Antistatic - - - - - High ankle - - - - Extra-deep sole profile - - Washable at 60 C 60 C 60 C* 60 C 60 C* 60 C 60 C 60 C Washable footbed - Footbed washable at 30 C 30 C 60 C 30 C 30 C 60 C 60 C - *Patterned clogs only handwash. PU PRODUCTS 29
Antistatic clogs anti-static, especially comfortable and can be disinfected Walking on different types of flooring automatically generates an electrostatic charge. This can be dangerous, because even the slightest discharge in an operating theatre or intensive care ward can lead to complications. The antistatic clogs protect patients in intensive care and sensitive operating technology from potentially dangerous discharges. Charges are constantly and gently dissipated, which avoids larger electrostatic impulses. The Super-Birki antistatic and Birki-Air antistatic clog models are fitted with replaceable anti-static footbeds. By contrast, the Birki anti-static model has an integrated footbed, which is made of a single piece of flexible antistatic blended foam the same material as the clog. 01 01 Klassik-Birki Antistatic n067 050 Green ALPRO Foam 35-46 Klassik-Birki Antistatic n067 070 Blue ALPRO Foam 35-46 30 PU PRODUCTS
01 01 Super-Birki Antistatic n068 050 Green Super-Birki Antistatic n068 070 Blue PU PRODUCTS Birki-Air Antistatic n063 050 Green 35-46 Birki-Air Antistatic n063 070 Blue 35-46 05 05 pu Replacement Footbed for Super-Birki Antistatic and Birki-Air Antistatic fleece n 5 5 PU PRODUCTS 31
ESD PRODUCTS Safe protection in ESD environments Especially work with sensitive high-frequency technology and electrical components requires specific protective measures. Alongside professional ESD equipment in the workplace, the ESD models provide effective protection against dangerous discharges.
The best protection against electrostatic discharges with TÜV-tested sandals 01 Anatomical shape gives toes and feet enough space, helps balance and promotes healthy feet. 1 1 Integrated static inhibitor ensures ongoing dissipation of electrostatic charges. 2 2 Deep footbed arches adjust to the natural shape of the soles of the feet. 3 3 Shock-absorbent cork core shaped precisely to match the shape of the soles of the feet. 4 05 Deep heel cup holds the foot securely in the bed and promotes a natural stance. 5 5 ESD ESD cork footbed The best protection against electrostatic discharges with TÜV-tested sandals and clogs All ESD models have been tested by TÜV Rheinland according to EN ISO 61340. They meet the specifications for professional C D S ESD 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 11 10 12 ESD conditions of 10 5 to 3.4 10 7 ohms (resistance). C = conductive D = dissipative S = shielding 34 ESD PRODUCTS
01 01 sofia ESD s263 238 Summer Night Blue Sofia ESD s263 228 saragossa ESD s500 598 ESD PRODUCTS Bilbao ESD n520 840 s520 848 n 39-46 s 05 05 kano ESD n500 580 s500 588 n 39-46 s Comfortably soft and the best protection Our with its shock-absorbing core offers much more than a regular soft insert. The is complemented by the slip-resistant tread and the soft suede lining, which in the ESD models also includes an integrated static inhibitor for optimal protection against electrostatic discharge. nnormal feet snarrow feet ESD PRODUCTS 35
01 01 Toulon ESD vegan n596 050 Navy Nubuk 36-46 Toulon ESD vegan n596 0 36-46 Mumbai ESD vegan n595 050 Navy Nubuk 36-46 Mumbai ESD vegan n595 0 36-46 05 05 Cork replacement footbed for Toulon and Mumbai Grey Fleece n5 200 36-46 Completely VEGAN Our Toulon and Mumbai models as well as the corresponding replacement footbeds made from cork with a fleece lining are produced without using leather or other animal products and are thus 100 per cent vegan. 36 VEGAN ESD PRODUCTS
01 01 Arizona ESD n089 410 s 089 418 White n089 290 s 089 298 White with Arizona ESD n089 430 s 098 438 Blue Arizona ESD n089 440 s 089 448 Basalt ESD PRODUCTS Arizona ESD n089 420 s 089 428 n089 310 s 089 318 with 05 n634 880 s634 888 Milano ESD White Birko-Flor 05 06 n634 860 s634 868 Milano ESD Blue Birko-Flor 06 nnormal feet snarrow feet ESD PRODUCTS 37
01 01 Milano ESD n634 510 s634 518 Basalt Milano ESD n634 790 s634 798 seoul ESD n089 340 s 089 348 White n 39-46 s seoul ESD n089 360 s 089 368 Blue n 39-46 s 05 seoul ESD n089 350 s 089 358 n 39-46 s 05 38 ESD PRODUCTS
01 Boston ESD n061 370 s 061 378 White Leather n 39-48 s 01 Boston ESD n061 380 s 061 388 Blue Leather n 39-48 s Boston ESD n061 360 s 061 368 Leather n 39-48 s ESD PRODUCTS Tokio ESD n061 410 s 061 418 White Leather n 39-48 s n061 280 s 061 288 White with n 39-48 s 05 Tokio ESD n061 390 s 061 398 Blue Leather n 39-48 s n061 270 s 061 278 Blue with n 39-48 s 05 06 Tokio ESD n061 400 s 061 408 Leather n 39-48 s n061 290 s 061 298 with n 39-48 s 06 nnormal feet snarrow feet ESD PRODUCTS 39
Construction of the ESD Walking on different types of flooring automatically generates an electrostatic charge. Subsequent contact with conductive materials and medical devices, but also with patients and colleagues, causes a sudden discharge. This is accompanied by a spark and a small electric shock. ESD sandals and clogs have been developed to provide protection and prevent unpleasant shocks (from 105 to 3.4 10 7 ohms, according to EN ISO 61340). 1 01 Soft suede 2 Flexible natural latex foam 3 Breathable upper jute layer 4 Shock-absorbent cork latex core 5 05 Stabilising lower jute layer 40 ESD PRODUCTS
01 Tokio Air ESD n061 300 s061 308 White Leather n 39-46 s 01 Tokio Air ESD n061 310 s061 318 Leather n 39-46 s ESD PRODUCTS linz ESD n583 150 s 583 158 White Leather n 39-46 s linz ESD n583 160 s 583 168 Leather n 39-46 s nnormal feet snarrow feet ESD PRODUCTS 41
05 Relaxation before, during and AFTER work The slippers with are the ideal companion for home and office alike. After all, these models offer comfortable relief and well-earned relaxation before, during and after work. The flexible footbed material is beautifully soft and has an immediately noticeable effect - without requiring lengthy breaking-in times. 43
Features of the Professional Anti-slip tread, TÜV-certified to EN ISO 13287:2007, SRC Shock-absorbing and flexible thanks to millions of microscopically small air bubbles Suede lining fits snugly against the sole of your foot Oil and grease resistant Tread depth >2.5 mm Heel pad made of latex Hard-wearing and higly durable 01 01 Cali s 113 453 Variety White cali s 113 443 Jazzed Up Blue 44
01 01 sofia s 263 093 Variety White sofia s 263 1 Accepted Yellow sofia s 263 153 Summer Night Blue sofia s 263 083 Jazzed Up Blue 05 05 sofia s 263 113 Babelfish Brown 06 06 sofia s 263 213 Delicate Apple 45
01 01 Sofia s 263 173 Nu Farm Red sofia s 263 163 Tolerance Turquoise sofia s 263 133 White sofia s 263 143 Brown 05 05 sofia s 263 123 06 06 sofia s 263 183 Patton 46
01 saragossa s 500 093 Variety White 01 saragossa s 500 1 Accepted Yellow saragossa s 500 893 Summer Night Blue saragossa s 500 873 White 05 05 saragossa s 500 863 06 06 Saragossa s 500 883 Patton 47
01 01 Bilbao n520 781 s 520 783 White n 39-46 s Bilbao n520 811 s 520 813 Blue n 39-46 s Bilbao n520 791 s 520 793 n 39-46 s Bilbao n520 801 s 520 8 Brown n 39-46 s 05 Bilbao n520 831 s 520 833 Grey Leather n 39-46 s 05 48
01 01 Bilbao s 520 823 Summer Night Blue Bilbao s 269 853 Jazzed Up Blue Bilbao s 269 863 Babelfish Brown Kano n500 761 s 500 763 White n 39-46 s 05 05 Kano n500 801 s 500 8 Brown n 39-46 s 06 06 Kano n500 781 s 500 783 n 39-46 s nnormal feet snarrow feet 49
06 JOLLY-CLOGS Trendy CLOGS for garden and leisure Whether patterned or in classic monotones, the Jolly by Alsa models are perfect whatever the occasion: for a city stroll, a visit to the outdoor pool or simply for pottering around the house. Made of natural cork, the anatomical footbed guarantees optimal comfort whilst creating an extremely healthy foot climate. It can also be washed at 30 C and can be replaced if required.
JOLLY-CLOGS Cultivating one s own garden is one of the nicest things imaginable on a warm summer s day. And when one s outfit also matches the flowers, shrubs and trees planted, the path from garden enthusiast to landscape architect is quickly paved... with the new Picture Clogs - not just for the garden. 01 Replacement footbed for Picture Clog s073 300 35-41 Replacement footbed for Jolly Fashion and Jolly Fashion Clog s073 000 n073 001 s 35-42 n 39-47 52 Jolly-CLOGS
01 01 picture Clog s072 010 Apples Celadon Green ALPRO -Foam 35-41 Picture Clog s072 0 Classic Flowers Pink ALPRO -Foam 35-41 picture Clog s072 0 Sunflowers Yellow ALPRO -Foam 35-41 picture Clog s072 0 Autumn Brown ALPRO -Foam 35-41 05 05 picture Clog s072 050 Rose ALPRO -Foam 35-41 JOLLY-CLOGS nnormal feet snarrow feet Jolly-CLOGS 53
01 01 Jolly Fashion-Clog n6 401 s6 400 Yellow ALPRO -Foam s 35-42 n 39-47 Jolly Fashion-Clog n6 411 s6 410 Red ALPRO -Foam s 35-42 n 39-47 Jolly Fashion-Clog n6 421 s6 420 Green ALPRO -Foam s 35-42 n 39-47 Jolly Fashion-Clog n6 441 s6 440 Blue ALPRO -Foam s 35-42 n 39-47 05 05 Jolly Fashion-Clog n6 431 s6 430 Brown ALPRO -Foam s 35-42 n 39-47 54 Jolly-CLOGS
01 01 Jolly Fashion n073 1 s073 0 Yellow ALPRO -Foam s 35-42 n 39-47 Jolly Fashion s073 070 Red ALPRO -Foam s 35-42 n 39-47 Jolly Fashion n073 061 s073 060 Green ALPRO -Foam s 35-42 n 39-47 Jolly Fashion n073 051 s073 050 Blue ALPRO -Foam s 35-42 n 39-47 05 05 Jolly Fashion n073 081 s073 080 Brown ALPRO -Foam s 35-42 n 39-47 JOLLY-CLOGS nnormal feet snarrow feet Jolly-CLOGS 55
07 KNEE PROTECTION Optimal mobility and improved comfort in wear ALPRO knee protectors and knee cushions serve as a relief while performing work in a kneeling position on the ground or near the ground. They distribute small punctual strains of the kneecap broadly and therefore virtually dissolve the pressure on knee and kneecap. The consequences: less strains, barely any pain, more comfortable working. ALPRO knee protectors were developed in cooperation with the association of commercial and industrial workers compensation insurance carriers. The ALPRO knee protection pad is also adapted to the anatomical form of the shin, providing improved comfort during wear. The knee pad has been tested by TÜV (German Technical Inspection Agency) and certified according to EN 144:20 + A1:2010 (personal protective equipment knee pad for work in a kneeling position). 57
Knee Protector Knee Protection Pad ALPRO knee protection PAD Through the special ergonomic arrangement of the Velcro fastenings the ALPRO knee protection pad can be fitted securely and individually on to the lower leg. The Velcro straps are clear of the back of the knee, which avoids constriction and at the same time allows optimal mobility.. ALPRO knee protectors The ALPRO knee protectors make for optimal knee protection while working done in a kneeling position. With the continuously variable Velcro straps the protectors can be properly adjusted and fastened to the knee. This way, all work on building sites, in the garden or in the workshop can be carried out knee-friendly and painless. The ALPRO knee cushion The ALPRO knee cushion provides immediate and easy knee protection for all work done during kneeling. Whether it is work in the garden, in the garage or in the house the anatomically shaped knee cushion made of shock-absorbing ALPRO -foam relieves the knees and protects against pain and possible injuries. 58 knee PROTECTION
01 01 ALPRO -Knee Protection Pad 0 2 Red ALPRO -Foam ALPRO -Knee Protection Pad 0 205 Blue ALPRO -Foam Replacement Velcro straps for knee protection pad 0 206 alpro -Knee Protectors 0 201 Red ALPRO -Foam 05 replacement Velcro Straps for Knee Protectors 0 2 05 06 alpro -Knee Cushion 0 200 (broad) 0 2 (normal) Red ALPRO -Foam 06 knee PROTECTION KNEE PROTECTION
Your qualified dealer with the friendly service. 081227/06 2013 Birkenstock Sales GmbH, Vettelschoß. No liability for any errors or misprints. Birkenstock Sales GmbH Rheinstrasse 10 53560 Vettelschoß Germany T: +49 (0) 2645 942 100 F: +49 (0) 2645 942 101 E welcome@birkenstock.com birkenstock.com 60