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Therm-a-Rest

Therm-a-Rest Trail Lite (Regular)

Best use

Made for
Backpacking and wild camping
Not for
Bikepacking, Winter mountain
Why these labels
  • Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
  • Bikepacking: Bulky for bike bags: packs to 8.8 litres
  • Winter mountain: R-value 3.2: too little insulation on frozen ground

From the maker's stated use and the published specs.

Mid Confidence: Medium
  • Summer wild camp: 4/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
  • Three-season hills: 4/10 UK hills in spring and autumn. Wind, rain, and nights near freezing.
  • Winter camp: 4/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Capped at 4: needs warmth 7+ (R 4 or more).
  • Weight: 5/10 How much it adds to your pack, compared with the whole market.

R-value 3.2 (ASTM).

Lowest price we found

£75.99 at Ultralight Outdoor Gear

In stock. Free delivery. Checked 8 Nov 2026.

RRP £90, checked 18 Oct 2026.

Go to Ultralight Outdoor Gear Compare 2 shops

Short backpacking trips and car-supported camping for people who want a self-inflating mat

Valve
WingLock
Type
Self-inflating
R-value
3.2 (ASTM)
Weight
740 g (Regular)
Thickness
3.8 cm
Size
183 x 51 cm
Packed size 8.8 L, 28 cm long and 20 cm across Compare with a 2-litre bottle

About as long as a 2-litre bottle and about twice as wide. Drawn to scale.

Where to buy

Ultralight Outdoor Gear £75.99 In stock. Free delivery.

View at shop

Ellis Brigham £90 In stock. Delivery £4.95.

View at shop

Prices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More

Our ratings (out of 10)

1 to 10, compared with the whole market. Each says what it's based on. How we score

Warmth

From maker's figures 5/10

How well it stops the cold ground chilling you. 5: Does the job. Average for wild-camping gear.

Maker's R-value of 3.2 (Therm-a-Rest's FAQ says it rates its pads to ASTM F3340-18) sits in the R 3–3.9 band: fine for spring and autumn, not winter.

Thickness

From maker's figures 3/10

How deep it is. Deeper is comfier, above all for side sleepers. 3: Below average. Fine for some trips, not others.

3.8 cm thick.

Quietness

Estimate from maker's specs: mat type (fewer than 3 reviews about noise) 7/10

How little it crinkles or squeaks when you turn over. 7: Better than most.

No review we found says how noisy it is, so this is an estimate from the mat type.

Weight

From maker's figures 5/10

How much it adds to your pack. 5: Does the job. Average for wild-camping gear.

The maker's 740 g for the Regular sits in the 550–749 g band, only just. Live for the Outdoors weighed it at 760 g and Ultralight Outdoor Gear lists 782 g without the bag; either figure would put it in the next band down (2).

Packed size

From maker's figures 1/10

How much room it takes in or on your rucksack. 1: A real weak point.

Packs to 28 x 20 cm: 3.1416 x 10 x 10 x 28 = 8,796 cm3, so 8.8 L, in the 7 L+ band.

What reviewers say (out of 10)

Ratings marked * are from reviews and are not part of the trip score. They are reviewers' scores, not our own measurements. How we score

Comfort*

Estimate: only 2 reviews about comfort (fewer than the 3 we need, so never above 8) 8/10

How comfy it is, including for side sleepers.

2 reviews on comfort, e.g. "the most comfortable of all of the pads we tested".

Stability*

Estimate: only 2 reviews about stability (fewer than the 3 we need, so never above 8) 8/10

How well you stay on it without rolling off or bouncing.

2 reviews on stability, e.g. "I found that I stayed on my Trail Lite pad the entire night and had no obnoxious crinkling noises".

In short

Good for

  • Short backpacking trips and car-supported camping for people who want a self-inflating mat

Strengths

  • Comfortable and quiet, and it doesn't slide around under a sleeping bag
  • Warm enough for UK spring and autumn nights (R 3.2)
  • Tough 50-denier polyester fabric, and Therm-a-Rest gives a limited lifetime warranty
  • Fairly cheap for a mat from a well-known maker

Weaknesses

  • Bulky: it packs to about 28 x 20 cm, much bigger than an air mat of the same warmth
  • Heavy for a backpacking mat: 740 g from the maker, 760–782 g on retailers' and reviewers' scales, and the Large is heavier again
  • Hard to roll back into the stuff sack; reviewers needed a fold-and-roll trick
  • Needs a few breaths on top of self-inflating to get properly firm
  • Only about 3.8 cm thick, so less cushioned on uneven ground than a thicker mat
  • Only R 3.2, so not for freezing nights without a foam mat underneath

Sources

We haven't tested this ourselves. Every score comes from these specs, tests and reviews.

ShowHide sources (5)
  1. Therm-a-Rest: Trail Lite Sleeping Pad specifications (Cascade Designs EU) Specs, 18 Oct 2026. Used for: warmth, thickness, weight, packed size
  2. Live for the Outdoors: Best sleeping mats for 2026 (Therm-a-Rest Trail Lite entry, group test) Test, 19 Aug 2026. Used for: comfort, stability
  3. The Inertia: Therm-a-Rest Trail Lite Sleeping Pad review (tested the Large size) Review, 9 Aug 2024. Used for: comfort, stability
  4. Travelling Lines: Therm-a-Rest Trail Lite (UK Ten Tors weekend review, 2018, earlier version) Review, 1 May 2018. The reviewer was sent it free by the brand
  5. OutdoorGearLab: Therm-a-Rest Trail Lite - Women's review (women's version, not used for scores) Test, 8 May 2020