The short version: one size, EU 39-45

StayLocked grip socks are one size that fits EU 39 to 45. There is no small, medium or large to agonise over. The sock is built from compression fabric with elastane that stretches to hold that whole range snugly against the foot. You go by your usual EU shoe size and that is it.

Why fit matters for grip

This is the part people skip. The two-sided grip only works when the sock is tight to your foot. The inside pads need to hold the sock to your skin; the outside pads need to hold that sock to your boot lining. If the sock is loose and bunching, the pads move around and the clamp weakens. A snug fit keeps every pad exactly where it should be — which is precisely why compression fabric is used.

A grip sock that does not hug your foot is just a sock with silicone on it. Fit is what turns the pads into a clamp.
StayLocked grip sock showing the compression fit and grip pads
Compression fabric and elastane stretch to hold EU 39-45 snugly.

If you are between sizes

Being between shoe sizes is not a problem here. The elastane and compression knit are specifically designed to accommodate a range, so the sock adapts to your foot rather than forcing you into a fixed size. Measure by your usual EU shoe size, pull them on, and the fabric does the rest. If your feet sit at the very edges of the range, the material still stretches or hugs to keep the pads in place.

A quick word on wide feet

The stretch that handles between-sizes also helps if your feet are on the wider side — the compression knit gives without going loose. If wide feet are your main concern, we cover it in detail in our guide to grip socks for wide feet.

Quick answer

  • One size fits EU 39-45 — no S/M/L to pick.
  • Go by your usual EU shoe size — that is all you need.
  • Between sizes is fine — the elastane accommodates a range.
  • A snug fit is essential — it is what makes the grip clamp work.

The bottom line

Sizing grip socks is genuinely easy: match your EU shoe size, trust the stretch, and expect a snug fit — because snug is what makes the grip do its job. Backed by a 14-day money-back guarantee, there is little risk in checking the fit for yourself. If you are still deciding whether they are for you, read our honest take on whether grip socks are worth it.