The A 640 PU clog helps keep you comfortable and safe as you work behind the scenes. Its enclosed design and high-traction sole offers reliable grip in hospitality environments, featuring a solid steel toe cap that protects toes and forefoot from impacts of up to 200 joules. The style is grounded in trusted anatomic support—feel the footbed and you’ll feel the difference after long hours on your feet. Wash and disinfect the clog at up to 176°F and its removeable footbed at up to 86°F.
- Removable contoured cork-latex footbed, washable at up to 86°F
- Durable PU upper
- Suede footbed lining helps keep you comfortable
- High traction PU sole
- Steel toe cap (200 joules)
- A630 / A640 Replacement Footbed
Frequently bought together:
STEEL
TOE
Upper: Polyurethane
Polyurethane, also known as PU, is a synthetic material ideally suited for use outdoors. The material is water-repellent and dirt-resistant and extremely easy to care for.
Insole: Natural leather
Natural leather can be recognized by its untreated surface. BIRKENSTOCK purposely does not treat surface grains and other characteristic features. BIRKENSTOCK uses sturdy leather with a thickness of 2.8 to 3.2 millimeters as upper material.
Footbed material: Cork
Cork is a sustainable material extracted from the bark layer of the cork oak. This natural product is insulating and offers very good cushioning.
Outsole: Polyurethane
Polyurethane, also known as PU, is a synthetic material ideally suited for use outdoors. It is water-repellent and dirt-resistant and very easy to care for.
The Original Birkenstock Footbed
A legendary design
At the heart of every Birkenstock design is the legendary footbed. The details are all in the design; each element of the footbed serves a purpose to encourage proper foot wellbeing and health. The result is signature style coupled with all day comfort.
Deep Heel Cup
The deep heel cup cradles the heel and keeps your natural cushioning right under the heel bone.
Longitudinal Arch Support
The longitudinal arch support runs along the sides of the footbed, providing stability with each step.
Transverse Arch Support
The transverse arch support runs through the middle of the footbed, helping ensure proper alignment and a solid stance.
Raised Toe Bar
The raised toe bar encourages the natural gripping motion of your feet, exercises the legs, and stimulates circulation.
More Toe Room
A roomy toe box allows toes to move more naturally, promoting better balance and correct foot alignment.
| Weight | 1.5 lbs |
|---|---|
| Color | Black, White |
| Gender | Men, Women |
| Size | 10-10.5, 11-11.5, 12-12.5, 13-13.5, 14-14.5, 5-5.5, 6-6.5, 7-7.5, 8-8.5, 9-9.5 |
| Width | Regular/Wide |
Fitting Guide
FITTING AND ADJUSTING TIPS
SIZING
How to measure your foot length
- Stand with the heel to a wall and put a measuring tape under your feet
- Read off the measured foot length in millimeters before your longest toe
- If you are between two sizes, choose the next higher, because feet are minimally greater under load
Birkenstock products are offered in European sizes. Please reference our Size and Width conversion charts below. You can determine your Birkenstock size by adding 31 to your U.S. women’s size and 33 to your U.S. men’s size.
Your feet should be able to move freely without your toes hitting the edge of the footbed.
| Size Conversion Chart | |||||
|---|---|---|---|---|---|
| Women | Men | Kids | |||
| U.S. Size | Birkenstock Size | U.S. Size | Birkenstock Size | U.S. Size | Birkenstock Size |
| 4 - 4 1/2 | 35 | 7 - 7 1/2 | 40 | 6 - 6 1/2 | 24 |
| 5 - 5 1/2 | 36 | 8 - 8 1/2 | 41 | 7 - 7 1/2 | 25 |
| 6 - 6 1/2 | 37 | 9 - 9 1/2 | 42 | 8 - 8 1/2 | 26 |
| 7 - 7 1/2 | 38 | 10 - 10 1/2 | 43 | 9 - 9 1/2 | 27 |
| 8 - 8 1/2 | 39 | 11 - 11 1/2 | 44 | 10 - 10 1/2 | 28 |
| 9 - 9 1/2 | 40 | 12 - 12 1/2 | 45 | 11 - 11 1/2 | 29 |
| 10 - 10 1/2 | 41 | 13 - 13 1/2 | 46 | 12 - 12 1/2 | 30 |
| 11 - 11 1/2 | 42 | 14 - 14 1/2 | 47 | 13 - 13 1/2 | 31 |
| 15 - 15 1/2 | 48 | 1 - 1 1/2 | 32 | ||
| 16 - 16 1/2 | 49 | 2 - 2 1/2 | 33 | ||
| 17 - 17 1/2 | 50 | 3 - 3 1/2 | 34 | ||
| Note: Birkenstock Footwear is made in European sizes | |||||
narrow 
regular | Women's Widths |
Mens's Width |
||
| Regular/Wide: American width equivalent C-D |
Regular/Wide: American width equivalent D-EE |
||
| Medium/Narrow: American width equivalent A-B |
Medium/Narrow: American width equivalent B-C |
ADJUSTING
Before trying them on, put one hand under the toe and one under the heel, then flex the footbed a few times. This will initiate the break in period and will help your new sandals feel comfy sooner.
Open all straps and step into the footbed. Close the straps comfortably, leaving enough space to allow your feet the freedom of movement. Exhale and enjoy.
WEARING
For the first five or six times you wear your new footwear, limit the time to just a few hours. This allows your feet and body to gradually get used to the contoured arch support as well as the straps and buckles.
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