The Earflap Beanie combines Alpaca, Eco2 Cotton(c), and Micro-Fleece to shield you from harsh weather conditions. The outer shell is is 60% U.S. Prime Alpaca and 40% Eco2 Cotton. This perfect combination of alpaca and cotton allows the beanie to breathe while wicking away moisture keeping you warm and dry. The Micro-Fleece inner lining is very soft and warm. A great combination for the extreme outdoors. One size fits all.