One size, built to fit.
Bold socks are engineered to fit women's 5 through 10 in one stretch-knit silhouette.
| U.S. | UK | EU | Foot length |
|---|---|---|---|
| 5 | 2.5 | 35 | 22.0 cm |
| 6 | 3.5 | 36 | 22.5 cm |
| 7 | 4.5 | 37–38 | 23.5 cm |
| 8 | 5.5 | 38–39 | 24.5 cm |
| 9 | 6.5 | 40 | 25.5 cm |
| 10 | 7.5 | 41 | 26.5 cm |
Why one size
Bold is engineered as a single stretch-knit silhouette across U.S & Canada women's 5–10. We tested seventeen prototype knits before landing on the one we ship today, with feet across the full range, including instructors whose left and right foot are different sizes.
The result: a sock that's snug at every foot in the range, never loose at the heel, never tight at the cuff. Tiered sizing (S/M/L) would trade simplicity for sizing complexity the engineering didn't need.
Snug is the point.
Grip socks work because the foot doesn't move inside the sock. If a Bold feels close-fitting when you first pull it on — that's correct. It'll relax slightly after the first class.
The cuff sits at the lowest ankle bone.
Bold's cuff is designed to land below the ankle bone for reformer work. If yours sits higher than you'd like, fold the cuff once for a low-rise look.
First-wash matters.
Cold-wash and tumble-dry low for the first wash to set the knit. After that, the fit is locked in for the life of the sock.
Materials & feel
Outer face: 82% combed cotton, 16% nylon, 2% elastane. Cool to the touch, breathable, soft enough for all-day wear.
Inner grip lining: Hidden medical-grade silicone bonded to the knit. You won't see it. You'll feel your foot stop moving.
Outer grip: Silicone dots fused at high temperature — they won't peel, ever. If yours do within 12 months, we replace them.