Sea to Summit
Sea to Summit Comfort Plus Insulated air mat (Regular, 183 x 55 cm)
Best use
- Made for
- Backpacking and wild camping
Why these labels
- Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
From the maker's stated use and the published specs.
- Summer wild camp: 5/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
- Three-season hills: 5/10 UK hills in spring and autumn. Wind, rain, and nights near freezing.
- Winter camp: 6/10 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 4.1 (ASTM).
Cold spring, autumn and winter wild camps where comfort and a back-up layer matter more than weight
- Valve
- multi-function valve
- Type
- Air
- R-value
- 4.1 (ASTM)
- Weight
- 845 g (Regular)
- Thickness
- 6.3 cm
- Size
- 183 x 55 cm
Packed size 4.6 L, 24 x 16 x 12 cm Compare with a 2-litre bottle
Shorter than a 2-litre bottle and about one and a half times as wide. Drawn to scale.
Where to buy
Ultralight Outdoor Gear £169.99 In stock. Free delivery. Sale price; shop page lists RRP £239.99 and the earlier spec (R 4.0, 820 g).
View at shop: Ultralight Outdoor GearAbsolute Snow £244.95 Out of stock. Shop page says currently unavailable and lists the earlier spec (785 g).
View at shop: Absolute SnowPrices 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 7/10How well it stops the cold ground chilling you. 7: Better than most.
Sea to Summit's ASTM F3340 R-value of 4.1 is in the R 4–5.4 band: three-season and winter use. (Its FAQ and Kampeermeneer say 4.0, the same band.)
Thickness
From maker's figures 6/10How deep it is. Deeper is comfier, above all for side sleepers. 6: A bit better than average.
6.3 cm thick.
Quietness
Estimate: only 1 review about noise (fewer than the 3 we need, so never above 8) 4/10How little it crinkles or squeaks when you turn over. 4: A bit below average.
One reviewer found it noisy: it makes a fair amount of sound and creaks when you move.
Weight
From maker's figures 4/10How much it adds to your pack. 4: A bit below average.
Sea to Summit's 845 g for the Regular is in the 750–999 g band (907 g packed with the stuff sack).
Packed size
From maker's figures 4/10How much room it takes in or on your rucksack. 4: A bit below average.
Packs to 24 x 12 x 16 cm, a box of 24 x 12 x 16 = 4,608 cm³, so 4.6 L, in the 4–6.9 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 9/10How comfy it is, including for side sleepers.
4 reviews on comfort, e.g. "I found that the Sea to Summit Comfort Plus Insulated was exceptionally comfortable".
Stability*
Reviewers' average 7/10How well you stay on it without rolling off or bouncing.
3 reviews on stability, e.g. "when I roll around in the night on this sleeping pad, there is no real change in air pressure".
Reviewers disagree on this.
In short
Good for
- Cold spring, autumn and winter wild camps where comfort and a back-up layer matter more than weight
- Side sleepers and light sleepers who like a thick, adjustable mat
- Rough or stony pitches, where a puncture in one layer still leaves the other working
Strengths
- Two air layers that inflate separately: firm bottom for protection, softer top to taste, and a working mat if one layer is punctured
- R 4.1 (ASTM F3340) and 6.3 cm thick
- Airstream pump built into the stuff sack; repair kit included
- Reviewers rate comfort highly
- Sea to Summit lists a Pillow Lock to hold its pillows in place
Weaknesses
- 845 g and about 4.6 L packed: heavy and bulky for backpacking
- Noisy: two reviewers mention crinkling when you turn over
- Durability is an estimate, not a reviewed score: no long-term report found
- Shop pages disagree on the specs (R 4.0, 785–820 g, 12 x 23 cm packed on older listings), so check the label you receive
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (6)
- Sea to Summit: Comfort Plus Insulated Air Sleeping Mat specifications (Regular: 845 g, R 4.1, 24 x 12 x 16 cm, 183 x 55 x 6.3 cm)
- The Inertia: The Sea to Summit Comfort Plus is Perfectly Redundant (mummy cut, R 4)
- This Expansive Adventure: Sea to Summit Comfort Plus Insulated Review
- Kampeermeneer.nl: Review: Sea to Summit Comfort Plus Insulated (Regular, 845 g, tested in autumn nights of 6 to 8 °C)
- Gear Patrol: Tested Sea to Summit Comfort Plus Insulated Sleeping Mat
- Backpackers.com: Sea to Summit Comfort Plus Insulated Sleeping Pad Review (Regular mummy)