8mm HeatWave Underfloor Heating Carpet Underlay offers the best of both worlds - a comfortable underlay, which is compatible with underfloor heating. It is manufactured with purpose made holes to enhance the breathability of the underlay, allowing for faster heat transfer. HeatWave is designed to excellent safety standards and is flame retardant. *Stock can sometimes be a different colour foam the from image shown as this is dependant on the foam availability at the time of manufacture.