Camping mat thickness matters most when your hip or shoulder presses towards the ground. But the thickest mat is not automatically the most comfortable, warmest or easiest to live with. Its construction and firmness affect the feel, while its insulation needs a separate check.
Choose thickness by trying the position you actually sleep in and considering how much space you can spare in the tent and your luggage.
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Start with your sleeping position
A side sleeper concentrates more of their weight around the shoulder and hip than someone lying flat on their back. In a shop or at home, lie on the mat for several minutes rather than simply pressing it with a hand. Turn over and check whether any part of you bottoms out.
With an adjustable air mat, try a few permitted firmness settings. A very hard mat can feel unforgiving even when it is thick. Releasing some air may help it conform to your shape, but releasing too much can let your hip reach the floor. Follow the maker’s inflation guidance rather than trying to make every mat behave like a bed at home.
The Sea to Summit Comfort Plus versus Ether Light XR comparison gives a concrete example of comparing layered construction with a thicker sleeping surface.
Thickness and warmth answer different questions
Use thickness as a dimension and R-value as insulation information. A large volume of air does not establish how a mattress performs on cold ground. Check the documented insulation of any mat intended for cool-weather trips.
As one example, the Therm-a-Rest XLite NXT lists both a 7.6 cm thickness and an R-value of 4.5. The fact that these are separate specifications is useful: do not infer one from the other. The Regular XLite NXT listing on Amazon UK is a starting point for comparing a documented air mat with other constructions.
Check what extra height does inside the tent
A taller mattress lifts you closer to sloping bedroom walls. Measure the available length and width at the height of the sleeping surface, especially if you use a thick pillow or sit up to change clothes. A mattress that fits flat on the floor can feel cramped once inflated.
For two people, consider whether both mattresses are similar heights. A large step between them can be awkward if you share a quilt or want to reach across for an item. Also check that the doorway opens freely and that bags do not block access around the bed.
Compare the complete carrying burden
| Travel style | Useful priority | Check alongside thickness |
|---|---|---|
| Walking to camp | Comfort for the weight and volume carried | Repair provisions and inflation equipment |
| Camping by train | A manageable packed shape | Whether it fits inside your luggage |
| Car camping | Sleeping comfort and tent fit | Boot space and the effort of packing it away |
If the mat is bulky, practise deflating or rolling it before the trip. The advertised packed size may be achievable, but it still has to be achievable by you on a busy departure morning.
Buy a mat that supports your sleeping position at a sensible firmness, has suitable insulation and fits the shelter. Once those conditions are met, more thickness is a preference to assess—not an automatic upgrade.
For a broader comparison of mattress constructions, see our camping mattress buying guide.
Reviewed 10 September 2026. This guide is based on published specifications and guidance.