The Castelli Gregge 15 Sock carries the batton from the highly aclaimed original Gregge Sock - Castelli have added 3 cm onto the cuff for even greater warmth and comfort. The foot-bed has also been improved giving it a thicker construction along its full length. This creates even more plushness and luxury off the bike and greater thermal insulation on it. Up your sock game with some Gregge Socks this winter and have your Castelli unfair advantage running from your head down to your toes.