Ultra-lightweight, highly elastic, semi-double mattress pad, made in Japan using Teijin V-Lap, distributes body pressure High breathability and less stuffiness air V-Lap(R) structure The fibers quickly absorb and release moisture from the body and humidity in the air. It also prevents stuffiness and keeps warm air inside, so it maintains the necessary warmth. Although the fibers are high density, they allow moisture to pass through easily.