Coverking Coverbond5™/ Mosom Plus™ is the king of all non wovens sold on the market. It is the only non woven material with FIVE layers of protection built in . We start with the top layer of polyester spun bond (all other manufacturers use polypropylene which has little or no resistance to UV degradation). We add two layers of polyethylene micro porous film and a meltblown layer (most competitors use one or the other). The fourth layer is spunbond and the fifth layer – (a Coverking exclusive) is polyester felt to protect you vehicle’s finish. Each layer is fortified with the finest UV retarding agents in the manufacturing process.