A mid-calf length, mid-weight merino wool terry loop sock. Suitable for trekking, hiking and activities in arduous wet environments where there is a need to keep your feet from feeling cold and clammy. • Outer: 96% Nylon, 3% Elastane, 1% Cuff Elastics. • Interlining: Porelle® membrane. • Inner: 38% Merino wool, 38% Anti-pilling acrylic, 24% Nylon.