Futon mattress, semi-double, highly elastic four-layer, made with Teijin V-Lap, made in Japan Enjoy a luxurious hotel-like sleep experience. It is possible even with a simple futon. Developed by Teijin, a domestic textile manufacturer Luxuriously made from two layers of high-performance fiber material "V-Lap(R)". The highly elastic, four-layer mattress provides a luxurious, fluffy sleeping experience. It's a completely new mattress. The secret to a good night's sleep is the four-layer structure Teijin's V-Lap(R), which is highly functional even on its own, is luxuriously layered in two layers!