New Era - Stretch Mesh Cap. Get into the game without losing your cool. Spacer Mesh panels on hat back allow cooling ventilation on even the warmest days. Fabric: 100% cotton in front two panels; 100% polyester Spacer Mesh in mid and back panels Structure: Structured Profile: Mid Closure: Stretch fit 39THIRTY FIT: Features a casual look with a stretch-to-fit styling, a contoured crown and precurved visor. Structured for stability with a classic cap shape. New Era products may not be resold without embellishment.