Helly Hansen Warm Ice Crew Running Top HH Warm Technology - Soft merino wool adds warmth and comfort. Flatlock Stitching - Reduces the risk of chafing and skin irritation. Pure Merino Wool - A non-itch, allergy neutral fabric delivers comfort and performance in equal abundance. Lifa Stay Dry Technology - A network of insulative fibres deliver warmth, durability and protection from the elements.