Cotton Rich Stretch Fabric. Ultra Soft. Cool Feeling. Light Weight. Features a White Terry-Cloth Sweatband. Back Elastic. Adjustable, Tie-Back Closure. One Size Fits All. Sizes: OS Fabric: Blossom (B): 55% Cotton / 42% Polyester / 3% Spandex; PrimaFlex (P): 52% Cotton / 35% Polyester / 13% Elastrell-P (Lycra); All Other Colors: 60% Cotton / 37% Polyester / 3% Spandex