Aspen and alder are ideal materials for the sauna. Thanks to the low heat conductivity, aspen and alder are the perfect sauna cladding materials as they will leave the surfaces pleasant to the touch. The flush finish and hidden fixings mean that you can enjoy your sauna with a flawless, nail-free look. The smooth surfaces and open joints create a finish that is both stylish and beautiful. There may be significant variation in the patterns, which is due to wood’s natural growth pattern.