Baleaf Men's Windproof Thermal Cycling Tight Pants 87% Nylon/13% Spandex Stretchy, breathable fabric wick sweats away. Windproof material protects from the cold, wind and wet weather Mesh panels behind the knees provide excellent breathability. Windproof panels in the front of knee keep you warm Soft fleece inside provides long lasting warmth and comfort Knee area are made of stretch nylon for stretch and freedom of movement Leg zippers for easy off and on. Back zip pocket for storing small items