Unisex luxury Alpaca Walking Socks 75% Alpaca 25% Nylon. Alpaca fleece is a luxurious, lustrous and soft natural fibre.It is warmer than sheep's wool, not prickly, and contains no lanolin, which makes it hypoallergenic.Alpacas are eco-friendly animals, efficient in their environment as they eat the tender shoots of grasses and plants, but leave the roots to regenerate.