Helly Hansen HH Warm Running Hat Merino Wool - Merino is nature's most technical, high-performance fibre. Its complex structure makes it remarkably soft against your skin, helps regulate your body temperature, and stays looking great wear after wear. LIFA Stay Dry Technology - Wicks away moisture to help keep you dry and comfortable. Flatlock Stitching - Cleaner stitching technique helps to reduce irritation. Allergy Neutral Non-Itch