All One Planet down sleeping bags (except the Booster Bag series) use sewn-off box wall baffles made from Baffletex, a lightweight mesh fabric that is extremely strong for its weight. Baffletex is air-permeable, with a one-way stretch knit that serves a number of purposes. The one-way stretch allows fill material to loft to its full potential, without leaving gaps. It also acts as a shock absorber within the bag, preventing damage from baffle blow-out, while the texture of the mesh 'grabs' the fill material and minimises shifting.