Tredaire underlay for carpets brings additional warmth and comfort where you need it most. The most efficient underfloor heating underlay for your carpets due its low tog rating allows efficient heat transfer through your carpets and into your rooms. As well as being an excellent thermal conductor the “Tredaire King” also feels luxurious underfoot, having superior comfort with a sound insulation rating of 42 db which will reduce impact sound from your flooring and a 0.80 tog value.