SoundStep XL Premium Foam Moisture Resistant Flooring Underlayment, Model SSXLPE600BLSS. This like-new, in-box roll measures 4 ft. wide x 150 ft. long x 2mm thick, covering 600 square feet. Designed for use under laminate, luxury vinyl plank, and engineered hardwood, it provides cushioning, sound dampening, and a moisture barrier. No damage or missing components noted.
