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This underlay is ideal for rooms with direct sunlight. It also offers the best sound reduction in the room. Note: if the temperature of your Vinyl Flex floor is expected to raise up to or above 45°C, for instance due to direct sunlight, it is essential to use the Heat underlay or to install without underlay. Optimal Sound Reductions Insulates against sound and heat Suitable for Underfloor Heating Use in areas of extreme temperature change and direct sunlight Provides the stable foundation that your quality floor Supports your click system Does not absorb any water