NRORO - SoundBarrier Soundproof Underlayment is 1.5-mm thick and made from premium IXPE material. This underlayment meets the requirements of Impact Insulation Class (IIC) 69 and Sound Transmission Class (STC) 68. Each roll is 3.34 ft wide by 33 ft long, covering 100 square feet. It is specifically designed for use with SPC and WPC click-in (floating) vinyl plank flooring, LVT, LVP, and laminate flooring. Additionally, it can be applied in other settings to reduce sound transmission and act as a sound barrier.