Rab
Rab Stratosphere 4 Sleeping Mat (Regular)
Best use
- Made for
- Backpacking and wild camping
- Not 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 3.8: too little insulation on frozen ground
From the maker's stated use and the published specs.
- Summer wild camp: 7/10 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: 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 3.8.
Lowest price we found
£99.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 2 shopsThree-season wild camps and bothy trips where a tough, comfortable mat matters more than weight
- Valve
- two-way valve
- Type
- Air
- R-value
- 3.8 (not ASTM)
- Weight
- 695 g (Regular)
- Thickness
- 8 cm
- Size
- 183 x 51 cm
Packed size 2.7 L, 24 cm long and 12 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 £99.99 In stock. Free delivery. Shop lists RRP £119.99.
View at shop: Ultralight Outdoor GearRab £120 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) 6/10How well it stops the cold ground chilling you. 6: A bit better than average.
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: only 1 review about noise (fewer than the 3 we need, so never above 8) 8/10How little it crinkles or squeaks when you turn over. 8: Clearly better than most.
One reviewer says it is impressively quiet, with no crinkle.
Weight
From maker's figures 5/10How much it adds to your pack. 5: Does the job. Average for wild-camping gear.
695 g (Rab's figure for Regular) sits in the 550–749 g band.
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 12 cm packed: 3.1416 x 6 x 6 x 24 = 2,714 cm³, about 2.7 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*
Reviewers' average 7/10How comfy it is, including for side sleepers.
3 reviews on comfort, e.g. "supportive enough for a decent night's sleep, but not especially plush compared to top-tier pads.".
In short
Good for
- Three-season wild camps and bothy trips where a tough, comfortable mat matters more than weight
- Rough or rocky pitches where a thin ultralight mat would worry you
Strengths
- Tough 75D recycled polyester on top and bottom, thicker than most backpacking mats
- 8 cm thick with a rectangular shape and oversized outer chambers that help keep you centred
- Pump sack and repair kit included
- Quiet, with a slightly textured top that grips a sleeping bag
- Weighs 695 g and packs to 24 x 12 cm
Weaknesses
- R 3.8 is modest: reviewers say not for the coldest nights, and we haven't scored warmth because Rab's page doesn't confirm ASTM F3340
- Heavy for its warmth: 695 g against 470 g for the Sea to Summit Ether Light XR (R 4.1)
- Wide vertical baffles feel less plush than box or cell baffles (Better Trail)
- Bulky when packed, at about 2.7 L
- BASE found the valve hard to work with gloves on
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.