Light Weight: Feather-light fabric fits like a glove to keep sweat out of your eyes and not interfere with helmets. Ventilated Mesh construction at the crown promotes airflow for maximum breathability. Long lasting, natural fibers within the fabric never wash out or degrade.It’s a one size fits all: Great for Wearing under helmets, motorcycles, bikes, football, lacrosse, or wear alone while Running, Jogging, Football, Lacrosse, CrossFit, Cross Training, Hiking, Working Outside, Yard Work, Concerts, Festivals, At Beach, Lake, Pool, or anytime you want to feel instantly cooler.Thin and durable fabric fits any helmets. Has ventilation for maximum comfort. Designed to keep you cool and fresh in hot and sweaty situations.