The brand new S-shape Sauna Backrest is made of natural wood (Canadian Premium Hemlock or Red cedar), has no stains, is non-toxic and wear-resistant, and is high temperature resistant. This ergonomic S-shape curved backrest is elegant and comfortable fitting any sauna room. Loading capacity 300 lbs Using the wood backrest to keep your back away from the infrared heater in the sauna room, gives you the safest and most relaxing way to enjoy the infrared sauna. Traditional sauna-Lean on the curved backrest is more relaxing and comfortable than on the traditional sauna bench. No assembly is needed. Overall Dimension (Medium): 20.5"(L) x 13.0"(W) x 2.6"(H) Overall Dimension (Large): 26.0"(L) x 16.6"(W) x 2.6"(H) Size Shopping Guide: For ergonomic reasons, it is recommended that individuals measuring 6'3" or taller or weighing over 200 pounds to opt for a generously sized 16.6-inch backrest. Otherwise, 13-inch backrest is sufficient. Furthermore, please note that the 4-Person Outdoor model is better suited for a 13-inch backrest, otherwise the backrest will protrude beyond the seat panel. This applies to the Purity 1-Person model as well. Wood Selection Guide: Red Cedar vs. Hemlock Both Red Cedar and Hemlock are excellent choices for indoor and outdoor saunas, offering natural durability and a versatile wood tone. However, if you or your family members have known sensitivities to cedar, Hemlock is the safer, hypoallergenic alternative. Choose based on your sauna's existing wood type: Your Sauna Wood Type Recommended Accessory Wood Notes Hemlock, Fir (or older models: Basswood, Okoume) Hemlock Best match for lighter, neutral tones. Mahogany Hemlock or Red Cedar Red Cedar complements mahogany's warm, rich color. Hemlock offers a lighter contrast. Red Cedar Red Cedar (strongly recommended) Perfect match for consistent color and grain.