The Waterproof Extreme Cold Weather Mid Length Sock from Sealskinz features a fully waterproof membrane with a wicking merino wool lining to keep your feet fresh and dry on the trail. Flat toe seams with footbed padding prevent painful rubbing and add comfort whilst absorbing shock.FeaturesFully waterproof socks from SealskinzWaterproof - three-layer construction, adding warmth and durabilityMerino wool lining - controls moisture and is insulatingZonal elasticationFour way stretch fit for 100% mobilityFlat toe seams - prevents rubbingFootbed padding - absorbs shock and reduces pressure