Paca Herd Socks– This is a mid-weight sock and this is our lightest alpaca sock and uses the finest micron of alpaca which is called baby alpaca. This is made with baby alpaca which is usually from the first shearing done around 1.5 years in age. The first shearing is a premium shearing as this is the softest fiber from the alpaca. This is a very good trouser sock for work. 41% Baby Alpaca, 34% Acrylic and 25% Nylon. Machine wash cold, Do not bleach, Tumble dry low and do not iron. Sizing is by shoe size and the socks are unisex Medium: 5-9, Large: 10-13 AlpacaArte - your home for warm, soft and comfy alpaca socks!