The Midweight Merino short boot sock is designed to be worn with an ankle-height motorcycle boot. As opposed to the lightweight sock, the Midweight sock is designed to be appropriate for the cooler months. The socks are comprised of more than 45% Merino and New Wool, and so are particularly effective at insulating heat. But because Merino is so effective at wicking, the sock will keep your feet dry as well as warm. But Bridgedale socks are more than just socks. They are feats of podiatric engineering. They are equipped with systems such as Flat Toe Seams for less bulk in the toe area, Shock Zones for additional cushioning, Y-Heels for better grip and Forward Flex to prevent bunching of the fabric beneath the tongue.