Trek 500 L Trekking Self-Inflating Mattress

A self-inflating mattress is made of an airtight envelope glued to an open cell foam in which the air circulates. When you unfold the mattress, it will return to its original shape and thickness (2.5 cm for the Trek 500 mattress) and fill with air. However, you do need to finish inflating it by mouth to adjust its firmness. Self-inflation is more or less noticeable depending on the thickness of the mattress.

Before using your mattress for the first time, unroll it, leave the valve open for 24 hours on a flat surface, and then inflate it and leave it, pressurized, for 24 hours with the valve closed. You can then put it away again. When camping, take out and unroll your mattress as soon as you set up camp, with the valve open for easy pre-inflation. A self-inflating mattress inflates to about 60 to 70% on its own. To finish the process, inflate it the rest of the way by mouth to adjust its firmness.

The foam provides thermal insulation.
The R-value expresses the mattress' performance and thermal insulation. The higher the R-value, the better the mattress insulates you from cold ground.
R-value 2.3 (measured in an external EMPA laboratory)
An R-value of 5.9 is equivalent to a minimum temperature rating of about -24°C. 0.7 is equivalent to +11°C
The R-value is not a standard, and each manufacturer can use their own criteria. A standard process is currently being developed.

The sleeping comfort or "postural comfort" of mattresses is defined by our Research and Development Centre. All our mattresses undergo mechanical tests to check the performance and resistance of the mattress to make sure you get the best sleep and the best recovery. We also carry out numerous field tests in real-life conditions.
Comfort differs greatly from person to person. You can adjust your mattress' pressure.

Make sure the silicone patches are in contact with your sleeping bag to help keep it from slipping off your mattress.