Extreme Sheets machine-washable fitted rubber sheet is 100% waterproof. Your Extreme Sheets are specifically designed to withstand your wildest bedroom play. They can be used with all types of lubricants including oil-based ones that can deteriorate traditional latex rubber making way for uninhibited fun. Sleeping may be the last thing on your mind but at the end of the night you want to be able to get some rest. Constructed from extra-soft rubber Ignites. Extreme Sheets can be used for sleep as well as play. Pillow case not included.