NIKE Pro Hypercool Vapor Skull Cap 4.0 80% Polyester, 11% Rubber, 9% Spandex Strategicaltly placed Nike Hypercool material for ventilation and breathability where its needed most Nike's Dri-FIT Fabric wicks away moisture to help kep you dry and comfortable during your workout Flat lock construction allows for better fit and zero distractions Nike Pro branding for visible brand recognition