Details The perfect winter running hat, the Brooks Notch Thermal Beanie keeps your head toasty warm and even resists odor. It won't slip off your head as you run either thanks to its secure design. Material Outer: DriLayer® 91% Poly; 9% Spandex Liner: Notched fleece Made with bluesign®-certified materials Fit One size fits all Details Holds in warmth thanks to the breathable notched fleece interior. An odor-resistant finish keeps this beanie fresh between washes. No slipping or sliding: stays in place during your workout. Weight N/A Brooks Notch Thermal Beanie