Fleece Cap Integrated Ear Flaps Brown Color Excess heat and moisture escape, so it's warm but not stuffy! 56-58cm Size adjustment strap included 100% Polyester UNISEX Uses "Graphene," the strongest material, winner of the Nobel Prize in Physics ① Light absorption and heat generation ② Far-infrared effect ③ Excellent thermal conductivity and effective breathability ◎ Covers your ears completely, tighten with the strap in the back for "warmth♪" ◎ Recommended for use indoors and in outdoor tents! ☆ Recommended Comment ☆ I wear this to bed and sleep warmly and soundly.