This is a pair of long socks that feels cool and comfortable. The fiber material Maple Cool ® comes in contact with blood vessels close to the skin of the ankles and behind the knees to help cool and retain moisture. It has pressure of 21hPa (.3 psi) around the ankles, 16hPa (.23psi) around the calves and 11hPa (.15 psi) around the ankles and is designed for comfortable pressure at bedtime. The ankle section has a flat design that is good for sleeping. It releases high moisture and uses silky material. It is also water-absorbing and dries quickly. The mesh-style knitting makes it breathable. It has an open toe design, releasing heat. Size M/L.