This 100% waterproof, windproof & breathable ankle-length sock featuring Hydrostop™ is perfect for use in a warm weather conditions. Constructed using Aquasealz™ three-layer technology that combines a bamboo lining for moisture control and comfort, a 100% waterproof hydrophilic membrane, and a durable nylon blend exterior with 4-way stretch for great fit and wearability. In addition, the Mautby waterproof socks have the addition of Hydrostop™. In serious downpours water can bead up on bare legs and calves and egress into the socks through the top. So we invented Hydrostop™, a silicone-like (although it is silicone-free) elastic taping around the inside cuff of the sock. This added protection reduces the chances of water dripping down your leg into your sock. Problem solved. *Please note that due to the close bond between sock cuff and skin, over prolonged use, some people may experience minor skin irritation due to the Hydrostop™ barrier rubbing against the skin. For those who experience any irritation, we recommend that Hydrostop™ socks are only used outdoors and not for a prolonged period of time.