Varier is all about changing positions. The Variable Backrest allows you to sit back, get support and stretch out. The Variable Backrest with cushion gives a softer support, which can feel more comfortable to some. Backrest in laminated wood with a beech core for strength and durability, and a top layer in Ash for a textured surface either in natural lacquer, Backrest cushion in molded polyurethane foam for back support.