They call it "Oracover(Ultra Cote)", which I got directly from their "catalogue". That type of english is somewhat prevalent in their manual along with steps that don't make sense and a lack of thoroughness. Oh well, this isn't my first one so no big. I got the Giles 202 which has the same covering as the SU31. The plane and covering look great. Some of their planes have something called PVC film, which I do not like. It's like a plastic and you can't do much with it after crashing.