Despite their flexibility, the bamboo blocks are remarkably robust and long-lasting. Bamboo's inherent strength and resistance to warping ensure that the backrest retains its shape and functionality over time, even with frequent use. Why Select a Bamboo Sauna Backrest? The harmonious blend of enhanced flexibility, superior comfort, improved ergonomics, and long-term durability makes this sauna backrest an unrivaled choice. Its meticulously crafted design ensures a more supportive and pleasurable sauna session, clearly outperforming traditional backrests with their fewer and less adaptable hardwood bars. Size: The backrest measures 20x15 inches. Average size for the sauna hats, seat pads and slipper. Material: Bamboo and wood for the backrest. Wool felt for the sauna hats?seat pads and slipper.