This alpaca blend sock is ideal for those looking for a comfortable sock fit with premium warmth, and/or for those on the move. Peruvian alpaca is a natural, technical fiber with remarkable thermal properties. Alpaca allows air circulation on warm days, and heat insulation on cool days. In this way, alpaca is able to prevent sweating in warmer weather, and contain heat in colder weather. These unisex socks are available in 3 colours & 4 sizes.