Zan Headgear Sportflex Skull Cap . Flat Seams In Order To Fit Comfortably Underneath Helmets Or Alone While Providing Coverage Of The Head And Ears. Fabric Is Brushed For Ultimate Softness And Has A 4 Way Stretch For Customizable Fit. 50+ Uv Protection. Solid Black. Materials: 87percent Polyester 13percent Elastane.