Our Tailwind Tri Hat is a lightweight, breathable hat that protects you from the elements. This hat goes the distance from a sprint to a full and all those miles in between. It uses a lightweight wicking woven polyester material that provides a layer of protection from mother nature on the top two panels. Dry Tech polyester mesh side gussets on the top keep your head cool for the length of your workout, and a soft polyester mesh wicking sweatband on the inside helps move sweat away from your head keeping you focused on the trail or road. And, it's machine washable!