Protect your pool from getting damaged by ice and dirt during the winter months this year. This helps alleviate the stress of ice expansion during the winter in your above-ground or in-ground pool. Connect multiple pads together using the attached hooks.Details:Black19" x 9" x 3"For above-ground or in-ground swimming poolsSuitable for all pool sizesFeatures a hook to connect multiple pads togetherRelieves the stress of frost pressure and ice expansionMay be filled with sandPlastic