Coolmax fabrics are specially designed to provide not only superior moisture management but also to enhance the wearer's comfort. The specially-engineered fibers provide enhanced breathability called "air permeability". Coolmax can be worn all year round as it acts as a great first layer, especially during high aerobic activities. It's superior moisture management will keep the bone-chilling perspiration away from your skin and move it to the outer layers for evaporation. Remember, you can't stay warm if your body's wet!