Ultra-Seal – ULTRA-SEAL® Foam Dock Seal with Head Pad is a patented design that provides the insulating benefits of a dock seal and the full trailer access of a dock shelter. The one-piece, diagonal-cut foam construction, with internal retention straps, enhances foam memory and retention while looking good on your dock for years. It seals the rear hinge gap on trailers without obstructing doorway. The Ultra Seal with head curtain allows for varying trailer heights.