They use all materials that are sustainable and environmentally friendly... things like organic cotton (SO SOFT), recycled polyester, and lenzing modal (which is made from beech tree pulp!! (stillbeingmolly.com)
The insulation for a new range of Vaude sleeping bags due in 2010, will comprise 50 % Tencel, a more benign form of nasty old viscose (aka Rayon), made from plantation tree pulp in a process that recycles most of the production solvents. (treehugger.com)
But Tencel found it way into the Ecollection by virtue of being a renewable plantation tree pulp that was converted into a biodegradable fibre through a recycled solvent process. (treehugger.com)