Rab
Rab Stratosphere 5.5 Sleeping Mat (Regular)
Best use
- Made for
- Backpacking and wild camping
- Also works for
- Winter mountain
Why these labels
- Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
- Winter mountain: R-value 5.5
From the maker's stated use and the published specs.
- Summer wild camp: 6/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
- Three-season hills: 7/10 UK hills in spring and autumn. Wind, rain, and nights near freezing.
- Winter camp: 7/10 UK winter or high ground. Below freezing, strong wind, possibly snow.
- Weight: 4/10 How much it adds to your pack, compared with the whole market.
R-value 5.5.
Lowest price we found
£119.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 2 shopsCold-weather and winter camps on a budget, where weight matters less than warmth and comfort
- Valve
- two-way valve
- Type
- Air
- R-value
- 5.5 (not ASTM)
- Weight
- 785 g (Regular)
- Thickness
- 8 cm
- Size
- 183 x 51 cm
Packed size 3.2 L, 24 cm long and 13 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and a bit wider than one. Drawn to scale.
Where to buy
Ultralight Outdoor Gear £119.99 In stock. Free delivery. Shop lists RRP £139.99; 1 left in stock when checked.
View at shop: Ultralight Outdoor GearRab £140 In stock. Free delivery.
View at shop: RabPrices 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
Estimate from maker's specs: maker's R-value (not ASTM tested) 8/10How well it stops the cold ground chilling you. 8: Clearly better than most.
Estimate from maker's specs
Thickness
From maker's figures 8/10How deep it is. Deeper is comfier, above all for side sleepers. 8: Clearly better than most.
8 cm thick.
Quietness
Estimate from maker's specs: mat type (fewer than 3 reviews about noise) 5/10How little it crinkles or squeaks when you turn over. 5: Does the job. Average for wild-camping gear.
No review we found says how noisy it is, so this is an estimate from the mat type.
Weight
From maker's figures 4/10How much it adds to your pack. 4: A bit below average.
785 g (Rab's figure for Regular, without the pump sack) sits in the 750–999 g band. Shop listings give 730–824 g.
Packed size
From maker's figures 6/10How much room it takes in or on your rucksack. 6: A bit better than average.
Maker gives 24 x 13 cm packed: 3.1416 x 6.5 x 6.5 x 24 = 3,186 cm³, about 3.2 L, in the 2.5–3.9 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) 8/10How comfy it is, including for side sleepers.
2 reviews on comfort, e.g. "The rounded rectangular shape makes for an excellent sleeping platform.".
Stability*
Estimate: only 1 review about stability (fewer than the 3 we need, so never above 8) 6/10How well you stay on it without rolling off or bouncing.
1 review on stability, e.g. "whilst my elbows and my knees sometimes slipped off the mat when turning, the RAB Stratosphere design did help keep me in the middle".
In short
Good for
- Cold-weather and winter camps on a budget, where weight matters less than warmth and comfort
- Side sleepers who want an 8 cm mat with a rectangular sleeping area
- Wild campers who want one mat for autumn to spring
Strengths
- Rab quotes R 5.5 with 250 g/m² of recycled Stratus R insulation
- 8 cm thick, rectangular, with oversized outer chambers that help keep you in the middle
- Pump sack and repair patch included; the two-way valve fills it in 3 to 5 pumps of the sack
- Won The Great Outdoors' Best Buy award
Weaknesses
- Heavy at 785 g, about 345 g more than the NeoAir XTherm NXT (R 7.3)
- Packs bulky: about 3.2 L at 24 x 13 cm
- Narrow at 51 cm: The Great Outdoors tester's elbows and knees sometimes slipped off
- Rab's page does not confirm the R-value is ASTM F3340, so we haven't scored warmth
- Only a basic puncture patch is included, and we found no long-term durability report
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.