Vinyl underlay with GripTec surface to prevent slipping, SelitBloc 1.5 mm GripTec is perfect for use as an underlay for vinyl or design floors, even in moisture rooms and over underfloor heating. With its pressure-stable foam core, it reliably protects the flooring from damage caused by loads. It also improves the room acoustics by reducing impact sound and walking sound. The innovative GripTec surface prevents the boards from slipping and the joints from opening.