These red PVC Tarps are 100% waterproof. The PVC vinyl is the same material we use for our tent tops. These heavy duty tarps are designed for use with inflatables, such as, bounce houses, obstacle courses and wet/dry slides. By placing them underneath you will protect from wear and tear caused from direct placement on top of concrete and blacktop and will keep clean of grass and dirt. They can also be used to protect tent tops from damage during assembly.