Pool Wall Foam protects against punctures to your pool liner. Create a smooth wall surface with this closed-cell foam padding that helps prevent rust, corrosion and other wall degradation. It keeps your liner looking like new for years to come. Wall foam is a 1/8″ thick foam and it comes in a 4 foot roll. Use spray adhesive (not included) to install it and it will protect your liner from constant friction against your pool wall, preventing tears or punctures.