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The Therm-a-Rest Z Lite SOL and NEMO Switchback are folding closed-cell foam mats. Both avoid inflation and provide an insulating layer without a valve or air chamber to puncture. Choose between them around surface comfort and how the folded mat fits your luggage, while checking that the insulation is suitable for the trip.
Table of Contents
What the specifications establish
The Z Lite SOL and Switchback both list an R-value of 2. That makes this a comparison of two similarly rated insulation levels, not a clear warmth victory for one brand.
| Feature | Z Lite SOL | Switchback |
|---|---|---|
| Construction | Folding closed-cell foam | Folding closed-cell foam |
| Listed R-value | 2 | 2 |
| Surface | Dimpled foam with reflective treatment | Hexagonal foam nodes with metallised film |
| Inflation required | No | No |
Comfort needs a personal check
Foam texture and firmness can feel different under shoulders and hips. Lie on each mat in your usual sleeping position if you can. Pressing it briefly with one hand is not a useful substitute for placing your body weight on it.
Side sleepers who need substantial cushioning may find that neither thin foam format provides enough pressure relief on firm ground. Buying the slightly thicker-looking mat will not necessarily solve that. Consider whether an inflatable mat is needed for comfort, with foam used as an additional layer where appropriate.
Measure the folded package
Foam pads retain a bulky folded shape. Check the space across your rucksack, bicycle or packed car, including whether the mat obstructs pockets or catches on vegetation. Use secure attachment points suitable for the load.
Compare the same length option. A short pad may produce an attractive weight figure while leaving part of your body outside the insulated area. Start with the size you will actually sleep on rather than the lightest number in a range.
Think about the whole sleep system
An R-value is resistance to heat flow, not a temperature guarantee. Your sleeping bag, ground conditions and personal needs still matter. Do not assume either pad is a sufficient standalone choice for cold ground simply because foam cannot deflate.
Follow each manufacturer’s orientation instructions. Therm-a-Rest specifies the reflective side up for the Z Lite SOL; do not automatically transfer that instruction to another brand’s construction.
Which should you choose?
Check the Z Lite SOL on Amazon UK and match the Switchback size to NEMO’s current specifications when comparing retailers. Avoid confusing the original Z Lite with the SOL version.
Choose the mat that feels better under your body and packs more conveniently. If neither is comfortable enough, change the sleeping arrangement rather than expecting a brand swap to transform a thin foam mat into a deep mattress.
Continue with our camping mattress guide.
Reviewed 10 September 2026. This guide is based on published specifications and guidance.