Characteristics
The characteristics of this fabric make it incredibly useful for keeping warm, particularly whilst being active. Fleece has a pile surface on both sides of the fabric, meaning each side has a layer of cut fibres. Air pockets can sit between the threads in this pile surface, meaning the material can hold in that bit more warmth.
Not only is polyester fleece warm and durable, but it is moisture resistant making it ideal for extreme weather conditions or for sportswear, due to it being warmer than wool and much lighter to wear.