HyperShellz waterproof socks are midweight seamless socks, excellent for any outdoor sports where need to keep the feet dry and warm.Features include:Three Layers Design:The sock is made by three layers, the outer layer, the middle membrane and the inner layer.Materials: The outer is 80%Nylon/20%Lycra, durable and quick dry, the lycra provide very good elasticity. The middle is highly breathable waterproof membrane. The inner is Merino wool which provide moisure transfer and nice touch feeling.Performance:Excellent waterproof and breathable performance, the waterproof hydrostatic pressure is more than 8000mm H2O, water vapor permeability is more than 12000g/m2/24h.