Made of polyester and nylon. Has a silicone lining on the inside to keep in place. Several sizes available. Manufactured by Sports Farm LLC. Size Information: Youth Medium 14" long - 4" top - 3" bottom Youth Large 14.5" long - 4" top - 3" bottom Small 16" long - 4.5" top - 3" bottom Medium 17" long - 5" top - 3" bottom Large 18" long - 5" top - 3.5" bottom