When you throw a normal cooler into the bed of a pickup truck or on the wet deck of a boat, it slides all over the place. It gets banged up and wrecks stuff around it. Heaven forbid, you should want to stand on it to get a better view of … whatever. A few large anti-skid pads strategically placed on the bottom of the cooler quickly eliminate all those problems.
To ensure good adhesion to the plastic, if the surface is rough smooth with some sandpaper or emery cloth. Then use rubbing alcohol to clean off the places where you intend to attach the pads.