Nike Men`s Pro Hyperwarm Long Sleeve Training Top Dri-FIT Technology helps keep you dry and comfortable. Mid-weight thermal fabric provides excellent warmth. Designed for a close, athletic fit. Underarm and back mesh panels for enhanced ventilation. Flat seams move smoothly against your skin. Underarm gussets and ergonomic seams help you move naturally.Fabric: Dri-FIT 88% Polyester,12% Elastane