Polartec Thermal Pro is the most advanced thermal fleece fabric made my Polartec. Polartec Thermal Pro has the ability to be made into a wide variety of textures ranging from rip-stop to simulated wool. Polartec Thermal Pro fabric is made of 100% polyester with velour, pebbled, or shearling surfaces that create air pockets to trap body heat keeping you war without extra bulk. Polartec Thermal Pro also provides superior moisture wicking attributes and dries quickly when wet while remaining completely breathable. Best of all, this versatile advanced fabric is machine washable.