Watch guide
Apple Watch
To find your Apple Watch case size, check the back of your watch or open the Watch app on your iPhone. Once you confirm your size, use the table below to identify your model.
| Series | Case Size | Band size |
|---|---|---|
| Series 1–3 | 38mm | S |
| Series 1–3 | 42mm | L |
| Series 4–6, SE | 40mm | S |
| Series 4–6, SE | 44mm | L |
| Series 7–9 | 41mm | S |
| Series 7–9 | 45mm | L |
| Series 10, 11, 12 | 42mm | S |
| Series 10, 11, 12 | 46mm | L |
| Ultra 1 / 2 / 3 | 49mm | L |
Then pick S or L on the product page.
How do I attach my band?
WHOOP
The WHOOP bands on this store fit WHOOP 5.0 and WHOOP MG. There is no size to choose.
| Model | Compatible |
|---|---|
| WHOOP 5.0 | Yes |
| WHOOP MG | Yes |
| WHOOP 4.0 and older | No |
How do I attach my band?
Materials & Safety
What’s actually in your watch band.
In June 2026 QIMA, an independent lab in Shanghai, tested samples of our bands against EU REACH Annex XVII, California Proposition 65 and ASTM F2999. They passed.
We do this because the things you wear every day are worth doing properly.
