Home A640 Polyurethane Black

A640 Polyurethane Black

Regular price $112.95 Sale price $33.88
70% OFF
Color: Black

Color
Size: 5-5.5

Size

size

Size Guide · Birkenstock
Size Guide
Birkenstock footwear is listed in European sizes and built around a contoured footbed. Use the conversion charts and width guide below to find your best fit. Your toes should never touch the edge of the footbed—aim for about ¼ inch (6mm) of space around your foot.
Women’s Sizing
Quick formula: U.S. women’s size + 31 = EU size. If between sizes, choose the next size up.
EU Size US Size UK Size Footbed Length (mm)
35 4 – 4.5 2.5 225
36 5 – 5.5 3.5 230
37 6 – 6.5 4 – 4.5 240
38 7 – 7.5 5 245
39 8 – 8.5 5.5 – 6 250
40 9 – 9.5 7 260
41 10 – 10.5 7.5 265
42 11 – 11.5 8 270
43 12 – 12.5 9 280
Men’s Sizing
Quick formula: U.S. men’s size + 33 = EU size. If between sizes, choose the next size up.
EU Size US Size UK Size Footbed Length (mm)
39 6 – 6.5 5.5 – 6 250
40 7 – 7.5 7 260
41 8 – 8.5 7.5 265
42 9 – 9.5 8 270
43 10 – 10.5 9 280
44 11 – 11.5 9.5 – 10 285
45 12 – 12.5 10.5 – 11 290
46 13 – 13.5 11.5 300
47 14 – 14.5 12 305
48 15 – 15.5 13 310
49 16 – 16.5 14 320
50 17 – 17.5 14.5 325
Kids’ Sizing
Children’s feet grow quickly—measure regularly and allow room for movement.
EU Size US Size UK Size Footbed Length (mm)
24 6 – 6.5 7 150
25 7 – 7.5 8 160
26 8 – 8.5 8.5 165
27 9 – 9.5 9 170
28 10 – 10.5 10 180
29 11 – 11.5 11 185
30 12 – 12.5 11.5 190
31 13 – 13.5 13 200
32 1 – 1.5 13.5 205
33 2 – 2.5 1 210
34 3 – 3.5 2 220
Width Guide
Regular / Wide
For medium to wide feet. On the footbed, look for an outlined footprint symbol. Women’s equivalent: C–D. Men’s equivalent: D–EE.
Outlined Footprint
Narrow
For narrow to medium feet. Fits most women’s feet. On the footbed, look for a solid/filled footprint symbol. Women’s equivalent: A–B. Men’s equivalent: B–C.
Filled Footprint
How to Measure & Test the Fit
1
Measure Foot Length
Stand with your heel against a wall. Measure from the wall to the tip of your longest toe in millimeters. Add 10mm for room to move.
2
Match to Chart
Use the footbed length column to find your EU size. If between sizes, choose the next size up—feet expand slightly under body weight.
3
Check Width Symbol
Look at the footprint printed on the footbed. Outlined = Regular/Wide. Filled = Narrow. Choose the width that matches your foot shape.
4
Flex Before Wearing
Before trying them on, flex the footbed by placing one hand under the toe and one under the heel. This begins the break-in process.
Breaking In Your Birkenstocks
1
Start Loose
Keep straps loose at first to avoid pressure points. Your feet need time to adjust to the contoured footbed.
2
Wear Gradually
Wear them around the house for 1–2 hours at a time. Gradually increase wear time as your feet adapt.
3
Tighten as They Mold
As the footbed begins to mold to your feet, you can tighten the straps for a more secure fit.
4
Check Toe Space
Your toes should never touch the edge of the footbed. Aim for about ¼ inch (6mm) of space around your foot.

Fit Note: Birkenstock shoes may feel roomy at first—this is intentional. The footbed is designed to let your toes spread naturally, and the upper will mold to your foot over time.

If your straps feel too loose even when tightened, a cobbler can punch extra holes. If there is significant room on either side of your foot in the footbed, you are most likely a Narrow width.

All measurements are approximate and based on European sizing. Footbed lengths include a small allowance for foot movement.

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A640 Polyurethane Black

A640 Polyurethane Black
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)
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.