SealSkinz Waterproof Mid-Length Socks These thin-weight, mid-length waterproof socks are perfect for a multitude of activities where minimal insulation and maximum breathability are required. The merino wool lining efficiently wicks moisture away from the skin & towards the hydrophilic membrane, which in turn moves moisture to the outside of the sock. The excellent moisture management of SealSkinz socks not only keeps your feet dry & warm, but also reduces/eliminates the friction that comes with wet feet that causes hot spots and blisters. 62% Polypropylene/29% Nylon/9% elastane outers. 36% Merino Wool/36% Acrylic/18% Polyester/5% Nylon/5% Elastane liners. Imported.