Metropolitan Systems Complete - Standard Underlay is a high performance underlayment for floating engineered hardwood, laminate, and SPC/WPC without pad attached. MSC Standard Underlay is manufactured in North America with a non-cross-linked foam, creating a textured surface, a strong cell structure, and more open cells. Vapor moisture moves around the flooring system protecting your floor. The construction offers excellent acoustical features and protects the floor locking system.