The Water Polo Caps are made out of a durable nylon material that comfortably conforms to any head shape. Secured to the head with a nylon tie, and equipped with strong plastic ear guards for protection during game play.The Water Polo Caps are sold in sets, numbered 1-14 (Extension Cap Sets available 15-26). Player Number appears in three locations, both sides and top of cap. Sets are available in White or Navy team colors and includes 2 Red goalie caps (#1 and #13).