Totally waterproof and windproof, with a heavier gauge knit than the company’s thinner ankle socks, and with a longer leg length, SealSkinz 100% Waterproof Mid Weight Mid Length Socks with Hydrostop are ideal for anyone operating in cold, wet weather conditions, where added insulation is imperative. And because Sealskinz, with Aqua Dynamic design and Stretchdry technology, are guaranteed 100% waterproof, they are able to keep feet warm and dry, with a fully breathable stretch fit for comfort.Sealskinz 100% Waterproof Mid Weight Mid Length Socks are merino wool pile lined, anatomically designed for a mid-calf length fit and constructed with 'Hydrostop' silicone-free grippers in the cuffs to reduce the possibility of water ingress. SealSkinz 100% Waterproof Thin Ankle Socks are elasticated in the cuffs, ankles and insteps and have hand linked toes for smooth seams, keeping your feet supported and comfortable, whatever activities you take on.(08/15)