The Bridgedale CoolMax Liner sock takes its job as a moisture-wicking layer seriously. Designed to be worn under other Bridgedale socks when you know you'll be encountering extremely moist conditions, like during spring mountaineering, this liner mimics the supportive shape of the heavier sock. The result is a system that fits together precisely and works together to keep your feet comfortable and dry. The CoolMax Liner is tough enough to be worn on its own, should temps rise or you need to air out your other socks.