Leader Accessories Travel trailer rv cover fits 18'-20' 3 layers SFS Size 246"x102"x104" 3 layer polypropylene top fabric keeps out rain and snow while single layer polypropylene side fabric venting inside vapor out Anti-hit reflective panels for added safety at night or while parking Air vents reduce wind stress and vent inside moisture out Extra reinforced corners with elasticized hem for custom-like fit and prevent tearing of your cover Water Resistant/UV stable and breathable material for maximum protection