Wash free technology cloth seat bag optional latex / sponge type back bag filled with down cotton solid wood frame carbon steel foot Latex + sponge style is breathable and comfortable, soft and elastic, not easy to collapse, sedentary and not tired The 105 ° tilt is more comfortable and fits the curve of the human body. The soft support allows you to relax and "fall" when you sit down The frosted carbon steel foot is made of ingenious technology, which is stable and has strong bearing capacity, and will not deform after long-term use