A performance thin weight, mid length waterproof sock featuring Hydrostop, designed specifically for MTB (Mountain Biking ) & offers a perfect balance of warmth and breathability. Our lightest waterproof sock, ideal for warm, wet days 100% waterproof, windproof & breathable – Constructed with patented Stretchdry technology Reduced water ingress – Hydrostop silicon free elicitation provides a secure fit & band Moisture control & comfort – Merino Wool lining Additional ankle support – Elasticated ankle & instep Secure comfortable fit – Y-gore heel construction Prevent rubbing – Hand linked toe closure created flat seam Hydrostop Usage Guide Seal Skinz Hydrostop technology creates a seal between the sock cuff & skin, helping to reduce the amount of water from running down the leg & into the sock. Due to this close bond between sock cuff & skin, we recommend that Hydrostop socks are only used outdoors & not for a prolonged period of time. Incorrect or prolonged use can result in excessive rubbing against the skin & may in a very small minority of cases cause minor skin irritation. The Hydrostop seal material has been fully tested to EN ISO 10993-5: 2009 & is OEKOTEX compliant.