Ultra-fine hairs from specially-bred Angora Rabbits or Goats. Rabbit angora fibers are exceptionally fine, soft and hollow. They have the highest heat retention and best wicking properties of any natural fiber and are 2-½ times warmer than wool. They have the widest comfort range of any synthetic or natural underwear fiber and do not absorb odors. Angora goat fibers, also called mohair, are long, silky, lustrous, very strong and known for their softness and sheen. They are lightweight and a good insulator. They tend to be non-crushing, non-matting and non-pilling.