Palos Designs Sleeper Sofa Bar Shield The bar shield covers the support bars on a sofa sleeper, helping to prevent discomfort. Sleeper Sofa Bar Shield can also be used as a bed board under a regular mattress. This sturdy vinyl-covered bar shield folds up for quick storage The Sleeper Sofa Bar Shield is better than a sheet of heavy plywood, because you can fold it to 12-1/2" x 24" for easy storage under the cushions or in a closet, and it won't ruin your bedding. Open, the Sleeper Sofa Bar Shield measures 48" x 48" x 1/4"-thick.