Flexible and snug fit to prevent the cold from seeping in.
Polyester is a synthetic material used in garments that need to be water repellent, lightweight, breathable or able to transport moisture away from the body – whether working in unison or on their own, depending on the function of the garment. For a specific garment's characteristics, see its product description.
The garment's material decides its characteristics and what functions the garment has.