FitPaws' products are designed, engineered and constructed specifically for dogs and their needs. We understand that our products will be jumped and stepped on constantly, and occasionally maybe even bitten or chewed. For this reason, we use super heavy-duty, nail resistant PVC to reduce the chance of puncturing the equipment. In the unlikely event that a FitPaws inflatable is punctured, rest assured that we have "burst tested" our products to 330lbs. to ensure our products do not explode and cause injury. We also ensure that all FitPaws products are phthalate free and safe for all animals.