Best Sauna Backrest (2025)
Updated February 2025 — reviewed by the Backyard Sauna Pro team
Most sauna benches are flat boards. They work fine for sitting upright, but the moment you want to lean back and actually relax, you're pressing your spine against a hard vertical plank. A backrest fixes that in about 30 seconds of setup.
Good news: a quality sauna backrest is cheap. It's one of the easiest upgrades you can make to any sauna. The main things to get right are material (only certain woods handle sauna heat safely) and ergonomics (the angle matters more than you'd think).
Quick Picks
Karibu Ergonomic Sauna Backrest
Contoured spruce construction with a curved upper section that actually supports the lumbar and shoulder blades. The open-slat design lets heat circulate through instead of trapping it against your back. Fits any standard bench depth.
- Material: spruce (splinter-free, heat-stable)
- Adjustable angle or fixed depending on model
- Works for barrel and cabin saunas
What to Look For
Material matters
Only use backrests made from sauna-grade wood. The four safe options are spruce, aspen, cedar, and alder. All of them stay cool to the touch even at 180 degrees and don't leach resins that irritate skin.
Avoid anything with pine (resin bleeds at high heat), hardwoods like oak or beech (they get too hot and splinter), or any painted or stained finishes. Bare, kiln-dried softwood only.
The angle
A backrest that sits at 90 degrees defeats the purpose. You want somewhere between 100 and 115 degrees of recline. Anything beyond 115 and you start sliding off the bench. Many backrests are fixed at a single angle, which is fine as long as it's in that range. Adjustable versions give more flexibility but add complexity and joints that can loosen over time.
Slat spacing
Open slats are better than solid panels. Heat needs to move. A solid backrest traps hot, moist air against your skin, which is uncomfortable and accelerates moisture damage to the wood. Slat gaps of half an inch to an inch are ideal.
Width
Standard bench width is 20 to 22 inches. Most backrests are built to match. Check the dimensions before ordering if you have an unusually narrow or wide bench. A backrest that overhangs the bench sides is a bruise waiting to happen.
Does a Sauna Backrest Actually Matter?
It depends on how you use the sauna. If you sit for 10 minutes and leave, probably not. If you're in for 20 to 30 minutes doing multiple rounds, your posture starts to matter a lot. Slumping against a flat vertical board puts pressure on the lower back and makes you want to cut sessions short.
A good backrest extends how long you comfortably stay in, which means you get more out of each session. For a $30 to $60 accessory, that's a strong return.
Care and Maintenance
Wipe down with a dry cloth after each session. If the wood starts to grey or darken, sand lightly with 120-grit and leave unfinished. Never use oils, varnishes, or stains inside a sauna. The heat will cause them to off-gas and the smell is unpleasant at best.
Store the backrest off the bench between sessions if possible. Letting it air out between uses significantly extends the life of the wood.