Giro HRC Plus Merino Wool Socks Eliminate Scratching Feelings which causes synthetics presses luxurious and soft merino wool fibers directly to the skin providing optimal comfort. These premium road and trail socks keep you warm in cooler temperatures thanks to their merino wool filling. providing additional heat retention. Moderate compression properties improve blood circulation and arch support improves pedaling comfort. Meryl Skinlife fibers are located along the outside of the sock for better moisture management. This nylon-based fabric has permanent anti-odor properties thanks to silver particles. This means long-lasting freshness even after tough rides when you sweat a lot. For greater durability, the toe and heel are reinforced with nylon inserts.