Insulated thermal fabric in this keeps the heat in while mesh panels under the arms provide ventilation. Stretch fabric allows for maximum range of motion so your swing speed is never impeded. - Callaway men's golf windshirt with mock neck, 1/4 zip front, and Callaway Tour logo on center-back neck - Insulated thermal fabric creates a barrier between you and cold weather - Stretch fabric ensures maximum range of motion - Zonal ventilation keeps you cool where you need it most - 92% Polyester / 8% Elastane - Machine Washable