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.