The Greensmart Komodo Netbook Sleeve (Black) is made of non-toxic eco-friendly Neogreene. It has 4 mm walls for optimal protection and minimum weight. This sleeve also has a specially designed gusset and mesh interior for your laptop to breathe. The Neogreene is waterproof too so if you spill on the outside, no problem. It is easy to grab zipper pulls( 2 by the way), which rounds out the thoughtfulness.