JNH Lifestyles 2SBR1 Ergonomic S-Shape Backrest (2 Pack) Designed for JNH Lifestyles Saunas Made of 100% natural Oak wood with finest workmanship Solid structure and S-Shape Pack of 2 S-Shape backrest Ergonomic Backrest.Exclusively work with Vivo, Joyous, Freedom Collection Saunas (any size) only.