InnoMax Pro Max Heavy Duty Stand-Up Waterbed Safety Liner, Super Single Durable thick heavy-duty vinyl safety liner 83% thicker than most standard liners Black Duraflex heater compatible black vinyl bottom heavy-duty stand ridged up side construction. Ample overcut design and reinforced corner construction Thicker in both vinyl and cardboard than most other liners on the market to prevent water spillage in the case of a mattress puncture or separation For peace of mind protect furniture and floors from water damage in case of a mattress leak or puncture Durable thick heavy-duty vinyl safety liner 83-percent thicker than most standard liners Black Duraflex heater compatible black vinyl bottom heavy-duty stand ridged up side construction Ample overcut design and reinforced corner construction Thicker in both vinyl and cardboard than most other liners on the market to prevent water spillage in the case of a mattress puncture or separation For peace of mind protect furniture and floors from water damage in case of a mattress leak or puncture