Extra low in the leg, for protection from the element during activities where minimal insulation and maximum breathability are required, SealSkinz 100% Waterproof Thin Ankle Length Socks are British designed and manufactured to be totally water resistant, fully breathable and windproof, while remaining flexible and stretchable for great fit and performance.These Sealskinz socklets have a hydrophilic membrane outer, with a merino wool lining, blocking water out while allowing sweat to escape, but unlike most waterproof membranes, Sealskinz Stretchdry technology allows their socks to fit closely to the body, aided by elasticated cuffs, ankles and insteps, with hand linked toes for smooth seams and a comfortable feel.(08/15)