The Expansion Set Water Polo Caps are numbered 15-26 and can be purchased in addition to the standard Team Water Polo Caps. The caps are made out of a durable nylon material that comfortably conforms to any head shape. Each Water Polo Cap is secured to the head with a nylon tie and protects the ears with strong plastic ear guards. The Expansion set is available in white or navy team colors. Available in Men's size only.