Sea to Summit
Sea to Summit Ultralight air mat, uninsulated (Regular, 183 x 55 cm)
Best use
- Made for
- Backpacking and wild camping
- Also works for
- Bikepacking
- 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.
- Bikepacking: Small enough for bike bags: packs to 0.8 litres
- Winter mountain: R-value 1.1: 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: 4/10 UK hills in spring and autumn. Wind, rain, and nights near freezing. Capped at 4: needs warmth 5+ (R 3 or more).
- Winter camp: 4/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Below this trip's minimum: needs warmth 7+ (R 4 or more).
- Weight: 9/10 How much it adds to your pack, compared with the whole market.
R-value 1.1 (ASTM).
Summer wild camps and hot-weather trips where weight and pack space come first
- Valve
- multi-function valve
- Type
- Air
- R-value
- 1.1 (ASTM)
- Weight
- 395 g (Regular)
- Thickness
- 5 cm
- Size
- 183 x 55 cm
Packed size 0.8 L, 18 cm long and 7.5 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and thinner than one. Drawn to scale.
Where to buy
Alpinetrek £72.07 In stock. Price shown as including duties and taxes. Free delivery from £85, with a small charge below that shown at checkout; ships in 5–7 working days.
View at shop: AlpinetrekAbsolute Snow £119.95 Out of stock. Shop page says currently unavailable.
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 1/10How well it stops the cold ground chilling you. 1: A real weak point.
Sea to Summit's R-value of 1.1 is under R 2: summer only, and the brand says it is for warm weather. Sea to Summit says on its site (its Comfort Plus page) that its mat R-values have used ASTM F3340 since January 2020.
Thickness
From maker's figures 5/10How deep it is. Deeper is comfier, above all for side sleepers. 5: Does the job. Average for wild-camping gear.
5 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 9/10How much it adds to your pack. 9: Among the best you can buy for this.
Sea to Summit's 395 g for the Regular is under 400 g (438 g packed with the stuff sack would be 4).
Packed size
From maker's figures 10/10How much room it takes in or on your rucksack. 10: The best you can buy for this.
Packs to 18 x 7.5 cm, a roll: 3.1416 x 3.75 x 3.75 x 18 = 795 cm³, so 0.8 L, under 1.5 L.
In short
Good for
- Summer wild camps and hot-weather trips where weight and pack space come first
- Back sleepers who want a bed-like feel from a very small pack
Strengths
- Very light at 395 g and packs to about 0.8 L (18 x 7.5 cm)
- 40D nylon fabric (Sea to Summit)
- Pump sack built into the stuff sack
- Repair kit and spare valve flap included
Weaknesses
- R 1.1 means summer only: it misses the Warmth minimum for the three-season and winter trips
- No review of the current version found, so comfort and durability are estimates, not reviewed scores (reviews of the earlier R 0.7 version are not counted)
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.