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Product Description Super Felt Insulating Underlayment, 4 mm Thickness, 44 in Width, 27-1/3 ft Length, Recycled Fiber, For Concrete and Wood Subfloors. Super Felt is 3mm thick insulating underlayment made to reduce noise and help cushion flooring; by absorbing noise instead of deflecting it, "Super Felt" provides a deep, rich sound; this felt underlayment is made from recycled fibers and compressed using a high heat manufacturing process; the film overlay protects engineered and laminate flooring from any moisture from the subfloor and includes an adhesive strip and 2-1/2" overlap for linking multiple rolls; keep floors warm in winter and cool in summer; for use over concrete and wood subfloors; coverage: 100 square feet per roll. STC:66 11C:67; Rating: 21, RValue:58. From the Manufacturer Super Felt is a 3mm thick insulating underlayment made to reduce noise and help cushion flooring. By absorbing noise instead of deflecting it, Super Felt provides a deep, rich sound. This felt underlayment is made from recycled fibers and compressed using a high heat manufacturing process. The film overlay protects engineered and laminate flooring from any moisture from the subfloor and includes an adhesive strip and 1-3/4” overlap for linking multiple rolls.