The cabin you’d hand your kids twenty years from now. The Solaris is Kirami’s solar-powered, off-grid electric sauna line, named to TIME’s Best Inventions of 2025. The Medium is the bigger of the two cabins in the line: a 3 kW Harvia KIP heater running off rooftop solar and a battery bank, with no electrical service to maintain. 86 by 86 inches, four to five people, 415 cu ft. Tile Oak cladding inside and out, Brushed Alder benches, solar-tinted panoramic glass, RGB LED light therapy. Built in Finland by Kirami. Twelve-week build, shipping included free.