Sealskinz mtb ankle socks w hydrostopsealskinz mountain bike ankle socks are performance waterproof socks that feature hydrostop these socks have been designed specifically for mountain bike conditions where minimal insulation and maximum breathability are required features this is the lightest sock in the sealskinz range ideal for warm wet days constructed with sealskinz prprietary stretchdry waterproof breathable and windproof technology hydrostop silicon free elastication provides a secu