When moisture in the air hits the cold walls or floor of the tent, it cools and turns to liquid, creating condensation under your camping mattress. While nature can't be stopped, condensation can be minimised thanks to this mat's anti-moisture properties. It's made using a high quality spacer mesh material that creates ventilation space between the mattress and the base of your tent. It also provides an extra layer of comfort as you sleep by providing another centimetre of cushioning underneath your mattress._·      Designed for use with Thule Foothill rooftop tent·      High-quality spacer mesh material - allows air to circulate under your mattress·      Helps prevent moisture from accumulating which can lead to mould and mildew·      Provides extra 1cm of cushioning below your mattress·      Dimensions: 119cm x 213cm (47" x 84")