When you need the cargo capacity that a rack provides, but won’t get in your way when the going gets rowdy \n Full Challenge Sailcloth 200 denier UHMWPE / Polyester woven laminated fabric \n Super tough rattle free mounting with metal hardware \n Fiberglass internal and exterior stiffeners \n High density closed cell foam frame sheet \n Please note: these panniers are made with a minimum of seams but are not fully waterproof \n Made in the USA with domestic and imported materials