Keep the cold out & the warmth in while always looking on-trend with MUK LUKS® Men's Heat Retainer Hat. It’s form-fitting design and super soft lining give you casual comfort and warmth all day long. Machine wash cold, no bleach, lay flat to dry. Imported. 83% Acrylic, 17% Polyester, 1% Spandex Upper. Multiple Color Options. OSFM.