Cashmere
Cashmere is from the soft fleecy underlayer of a cashmere goat. These fibres are of extremely fine diameter (less than 19 microns, comparatively human hair is 60 - 120 microns) which is why cashmere feels so soft. Also, cashmere is a high loft fibre (air within the fibre) which translates into a plush, luxurious fabric with a silky feel.
Cashmere wool provides excellent insulation and is at least 3 times warmer than merino wool. When properly cared for, cashmere gets softer with age. When cashmere is cared for correctly it can last a lifetime. It is a timeless fabric and classic styles will always be on-trend.