The one piece back shell is made from FR and water repellent 100% Kevlar knit fleece 7.5 oz. fabric with exceptional flexibility across back of hand.A non-restricting Eversoft® leather knuckle band is sewn across back for added knuckle protection. Elastic is sewn into wrist crease for close fitting cuff. Back is lined with a layer of 6 oz. modacrylic non-melting and non-dripping liner.