Therm-a-Rest
Therm-a-Rest Vesper 0 °C Down Quilt (Regular)
Where it fits
- Also works for
- Bikepacking, Backpacking and wild camping
- Not for
- Winter mountain
Why these labels
- Bikepacking: Small enough for bike bags: packs to 2 litres
- Backpacking and wild camping: Light to carry: 0.4 kg
- Winter mountain: Comfort rating 5 °C: too cold for winter nights
From the maker's stated use and the published specs.
- Summer wild camp: 9/10 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 7+ (comfort 0 °C or colder).
- Winter camp: 4/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Capped at 4: needs warmth 9+ (comfort -5 °C or colder).
- Weight: 10/10 How much it adds to your pack, compared with the whole market.
Comfort 5 °C, limit 0 °C (EN 13537).
Lowest price we found
£322.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 2 shopsWarm-weather and shoulder-season UK camps, with nights down to about 5 °C and a mat that fits the straps
- Comfort
- 5 °C
- Limit
- 0 °C
- Fill
- 900 fill down
- Weight
- 440 g (Regular)
Packed size 2 L, 15 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 £322.99 In stock. Free delivery. Regular. RRP £379.99 on this shop's page; this shop lists 459 g.
View at shop: Ultralight Outdoor GearEllis Brigham £380 In stock. Free delivery. Regular.
View at shop: Ellis BrighamPrices 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 5/10How cold a night you can sleep comfortably through. 5: Does the job. Average for wild-camping gear.
Therm-a-Rest's EN comfort figure is 5 °C (limit 0 °C), in the 0.1 to 5 °C band. Trailspace found the comfort figure the honest one (cold spots from about 7 °C, and it says the quilt should be named for 5 °C), and Advnture was warm in it at its comfort rating.
Room inside
Estimate: only 2 reviews about room inside (fewer than the 3 we need, so never above 8) 6/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 6: A bit better than average.
Reviewers disagree: one finds plenty of room for side sleepers, the other found it only just wraps round at the shoulders.
Reviewers disagree on this.
Weight
From maker's figures 10/10How much it adds to your pack. 10: The best you can buy for this.
Therm-a-Rest gives 440 g for the Regular, under 700 g.
Packed size
From maker's figures 10/10How much room it takes in your rucksack. 10: The best you can buy for this.
Therm-a-Rest gives only two figures, 15 x 13 cm, so it's a stuff sack and we take the smaller one as the width: 3.1416 x 6.5 x 6.5 x 15 = 1,991 cm³, so 2.0 L, under 4 L.
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 to sleep in*
Reviewers' average 9/10How comfy the shape, hood and fabric feel; not the temperature rating.
3 reviews on comfort to sleep in, e.g. "remarkably comfortable, with really soft fabric".
In short
Good for
- Warm-weather and shoulder-season UK camps, with nights down to about 5 °C and a mat that fits the straps
- Weight-saving backpackers who sleep fairly still and use an insulated mat
Strengths
- 900-fill hydrophobic down in a box-baffled quilt
- No zip or hood to snag, and easy to throw off on mild nights
- Three reviewers found it comfortable to sleep in at its comfort figure
Weaknesses
- A quilt has no hood and doesn't close round you: at 147 cm across the shoulders a reviewer of 173 cm only just wrapped it round himself, and drafts began below about 7 °C for another
- The 0 °C in the name is the limit rating; the comfort rating is 5 °C, and Trailspace says it should be sold as a 5 °C quilt
- One pad strap is supplied instead of two, so it seals poorly if you move around
- Narrow foot box, and a collar snap that came loose in two reviews
- Two of the four reviews (OutdoorGearLab and Trailspace) tested the 2019 version; Advnture and The Big Outside tested a version with the same fill and weight
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (5)
- Therm-a-Rest (Cascade Designs): Vesper 0 °C Down Quilt product page (EN rating, weight, packed size)
- Advnture: Therm-a-Rest Vesper quilt review (0 °C version)
- The Big Outside: Review of the Therm-a-Rest Vesper ultralight backpacking quilt (0 °C version)
- OutdoorGearLab: Therm-a-Rest Vesper quilt review (0 °C version)
- Trailspace: Therm-a-Rest Vesper quilt review by Twig, a long-distance hiker (0 °C version, December 2019)