This 100% waterproof, windproof & breathable mid-length blue sock featuring Hydrostop is perfect for use in a warm weather conditions. Constructed using Aquasealz three-layer construction which 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 Scoulton 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. 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.