The Altera Alpaca Adventure 12" OTC and 9"Crew Heavy Weight Sock are our heaviest sock. It is lined with natural alpaca for comfort and performance.  This sock has a dense terry loop construction throughout the entire sock for cushion, a reinforced heel and toe for durability and built-in arch support for a great fit. 
 
39% Alpaca
28% Polyester
14% Nylon
14% Nylon Silver
4% Acrylic
1% Spandex