Castelli Gregge 15 Sock Large/X-Large Black/RedThe Castelli Gregge 15 is a Merino Wool, 15mm Cuff sock. The specific blend of wool used in these socks is naturally able to regulate the temperature and moisture concentration inside itself. It also contains a reinforced toe and heel to increase the overall durability of the sock. Available in Dark Gray/Light Blue, Climbing Ivy/Light Steel Blue, Black/Red, Black/Giro Pink and Black/Orange Fluo.8055688545055