Only tried on, never used. Please note that I will pack it compactly and ship it using the cheapest method available. (No box included) These are sleeping socks made with thick Polartec Alpha Direct, which offers an excellent balance of breathability and warmth. They are lighter than down socks, provide moderate warmth, and are comfortable without causing stuffiness. The socks have a wrap-around fit that doesn't constrict the ankles or heels, gently protecting hikers' feet from the cold until morning. *Alpha Socks are an upcycled product made from scraps of Alpha Vest material.