Feetures! knows that anyone interested in a performance running and hiking sock is probably going to need something for the colder months. As a result, Feetures! conjured up the Elite Merino+ Ultra Light Quarter Sock with a blend of warm, luxurious merino wool, rayon, nylon, and Lycra. Ultra-thin construction keeps this sock close to your foot for a streamlined fit, and elastic materials interwoven into the merino wool offer the type of support that you"ll come to appreciate after miles and miles of trail. Product FeaturesMaterial: 32% rayon from bamboo, 31% wool, 33% nylon 4% LycraHeight: ankleClaimed Weight: midweightRecommended Use: trail running, hiking, road runningManufacturer Warranty: lifetime