NWT: Lululemon unisex High Ventilation Running Hat Coverage is a breeze in this lightweight running hat. A small opening at the top over airy mesh fabric means maximum airflow during hot, sweaty runs. Product Details Designed for Running Lightweight Breathable mesh fabric lining Interior mesh fabric sweatband wicks moisture to help keep you dry Adjustable back closure tucks into a secret garage and helps you customize your fit Reflective details Small vents on top of the hat