Sealskinz best selling Mid weight. Mid length sock, now with a soft touch outer fabric for luxurious feel and superb performance. New soft touch polypropylene outer fabric gives you a softer shell with the same hard wearing properties you've come to expect from us. Totally waterproof, breathable and windproof. Mid weight sock offering the perfect balance of warmth and breathability. Material: 98% Polypropylene, 2% elastane.