Earthwool SoundShield plus R2.7 Wall insulation is our highest rated option. The super-high density glasswool insulation offers superior performance, with the ultimate in acoustic and energy-saving properties, creating a peaceful environment in your home by absorbing sound and keeping it where it should be. The super-soft and easy to handle benefits of Earthwool have been further enhanced with TwinTech. TwinTech heralds another advancement in insulation manufacture - the dual forming technique ensures a smooth finish on both sides of the insulation, which improves product handling and appearance. Earthwool is made using up to 80% recycled glass and with ECOSE Technology, a sustainable, bio-based binder that contains no added formaldehyde.