Nike Dry Unisex, Cool Grey, Size . stay warm. stand out. the nike dry running knit hat helps keep you warm and visible on your run with a fleece-lined interior and reflective elements. benefits dri-fit technology helps keep your head dry and comfortable fleece-lined interior for premium warmth reflective elements help keep you visible on low-light runs snug fit helps lock in warmth product details fabric: body: dri-fit 57% polyester 43% wool. lower panel: dri-fit 88% polyester 12% elastane. lining: dri-fit 88% polyester 12% elastane. hand wash imported : .