Therm-a-Rest
Therm-a-Rest Vesper 20 Quilt
No citable owner-review average published for this one, so no stars.
Nineteen ounces, 900-fill goose down, a 10-denier shell and an EN comfort figure of 32 °F. The Vesper is one of the very few quilts from a mainstream brand that publishes a lab rating at all, and the number it publishes is worth reading carefully: a bag called a 20 that tests to a 32 °F comfort rating is a bag most people will feel cold in at 20. That is not a Therm-a-Rest problem, it is what the 20-degree label has always meant, and the Vesper is one of the few products honest enough to show its working. The SynergyLink straps are the good kind — they let the quilt float rather than pinning it flat.
Label against lab
Sold as a 20 °F bag; its EN 13537 comfort rating is 32 °F, which is 12 °F warmer than the name suggests. Plan around the comfort figure, not the label. Why the gap exists
At that temperature the pairing table wants at least an R 3 pad underneath it.
Size run
One product, 2 sizes. The headline numbers on this page describe the Regular.
| Size | Weight | Approx. price | Length | Shoulder girth |
|---|---|---|---|---|
| Regular | 1 lb 3 oz | ~$460 | 79 in | 49 in |
| Long | 1 lb 5 oz | ~$500 | 83 in | 52 in |
Specifications
Highlights
Features
- ISO or EN rated
- Hydrophobic down
- RDS down
- Pad attachment straps
- Foot vent
What it does well
- 19 ounces including a snap-closed footbox — competitive with cottage quilts from a brand with a repair department.
- Publishes EN comfort and limit figures, which almost no quilt on the market does.
- 900-fill goose down, RDS-certified and PFAS-free hydrophobic-treated.
- SynergyLink straps hold the quilt to the pad without flattening the down against it, and come off entirely when you want a blanket.
- Packs to 5.5 × 8 inches, small enough to disappear into the bottom of a 40-litre pack.
What it costs you
- The 32 °F comfort rating is twelve degrees off the name — plan the trip around 32, not 20.
- $460 for a quilt is at or above the custom cottage makers, who will let you specify overfill and width.
- 10-denier shell is delicate; this is not the quilt to drag over granite or use around a fire.
- 49-inch width is narrow for a side sleeper who moves, and drafts are the predictable consequence.
- No width options at all — one girth, two lengths.
Those two lists are drawn from Therm-a-Rest’s published specifications and from reviews that measured them. They are not owner sentiment — anything owners said appears under its own heading below.
What owners say
Distilled from owner discussions and long-term published reviews, not from anything measured here.
The Vesper's owner reception divides almost entirely along what people paid. Bought on sale, owners are happy and recommend it. Bought at full price, the comparison with cottage quilts gets made quickly and unfavourably — one owner returned theirs and bought a cottage quilt with more down in it for similar money.
Temperature is where the useful detail sits. Owners put the comfortable range at roughly 30 to 50 °F, and someone who took it into the low 20s needed an extra blanket over the top. That matches the published EN comfort figure of 32 °F rather than the 20 on the label, which is a good illustration of why the lab number is the one to plan around.
One reason people choose it over a cottage quilt has nothing to do with the quilt: buying from a shop with a returns policy makes trying your first quilt a low-risk experiment.
What owners like
- Owners who bought it on sale are happy with it, and several specifically recommend waiting for one.
- Being stocked by a large retailer is cited as a genuine advantage — people bought it rather than a cottage quilt precisely so they could return it if quilts turned out not to suit them.
- The weight is competitive with cottage quilts at similar ratings, which owners notice.
- The lighter versions in the same line get recommended as summer quilts on the strength of the same construction.
Common complaints
- At full price owners call it overpriced, and at least one returned theirs and bought a cottage quilt instead at a similar price with more down in it.
- Owners put its realistic comfortable range around 30 to 50 °F, which is well above the number on the label.
- Used into the low 20s, one owner had to layer another blanket over it to stay comfortable.
- Cottage makers offer overfill and custom width at this price and this quilt offers neither.
Questions owners ask
What temperatures does it actually work at?
Is it worth the money against a cottage quilt?
Is it a good first quilt?
Therm-a-Rest Vesper 20 Quilt, head to head
Others in the same band
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Therm-a-Rest
Therm-a-Rest Corus 20 Quilt
The Vesper's argument made in cheaper materials: same shape, same straps, same EN comfort rating of 32 °F, but 650-fill duck down inside a 20-denier shell instead of 900-fill goose down inside a 10. That costs seven ounces and saves $150, which for most weekend backpackers is the right side of the trade. The thicker shell is also more forgiving of the way quilts actually get used — dragged half-off the pad, sat on at breakfast, stuffed wet.
Best for: First-time quilt buyers who don't want to gamble $460
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Katabatic Gear
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Katabatic's three-season quilt, and the one most of its customers should probably buy: 30 °F, a sewn differential-cut footbox, 19.8 ounces and a 4.5-litre packed size. The footbox is closed rather than zippered, which is lighter, warmer and smaller-packing than the Flex — the price is that it cannot become a blanket. For summer and shoulder-season trips in the mountain west it is the quilt that shows up most often on gear lists, and the loft figure (2.25 inches per side) is published so the rating has something behind it.
Best for: Summer and shoulder-season trips in dry mountain country
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Sea to Summit
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One of exactly two quilts in this catalogue with a published ISO comfort figure, and the only one where the limit lands exactly on the number in the name — 30 °F limit, 39 °F comfort. Nineteen ounces of 850-fill down that zips into a closed footbox for a cold night and opens flat into a blanket for a warm one. Sea to Summit's ratings discipline is the reason to buy it rather than a cottage quilt at the same price: you know what you are getting before you sleep in it.
Best for: Summer and shoulder-season quilt users who want a lab number
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