Horizon Ventures HV-9X30 Non-Skid Pool Ladder Pad, 9 x 30, Blue Textured; Non-skid Top and Smooth Underside that clings to Liner Will not move Sizes to Fit all Ladders; Drop-in-Steps and "Wedding Cake" Steps Available in 3 Sizes and can be trimmed to custom size Durable and Colorfast EVA Polymer Material will last for Years No grooves or ridges that invite algae growth