The Castelli Cubi 18 Sock uses a merino wool blend to create a sock that has all the natural features of merino wool but with enhanced durability. Wicking, insulating, naturally odourless, and with a luxurious feel, merino wool is ideal for long winter rides. A terry loop knit under the sole is used for extra padding and warmth. The 18cm cuff keeps comfort levels high. Key Features: Merino wool blend,Terry loop knit under foot for padding and extra warmth,18cm cuff.