The Therm-a-Rest Vesper 45 Ultralight Quilt is a 12 oz warm-weather quilt with premium materials and impressive performance features for the weight like a draft collar, pad attachment, shaped footbox, and wide girth. It’s exciting to see such a high level of quality in an off-the-shelf quilt compared to the custom-made quilts used by many backpackers.
Specs at a Glance
We tested the Regular version; there is also a Long version (which is also three inches wider).
- Quilt Weight (manufacturer’s): 12 oz / 0.34 kg; (we measured 12.4 oz w/pad attachment strap)
- Compression stuff sack weight (tested): 1.4 oz. / 0.04 kg
- Width 58” / 147 cm
- Length: 75” /190.5 cm
- Shoulder girth: 58” / 147.32 cm
- Hip girth: 51” / 129.54 cm
- Footbox girth: 37” / 93.98 cm
- Fits a person up to 72” (6 feet) / 1.83 meters
- Packed size: 4.5”x 6” (in compression sack) / 11.43 cm x 15.24 cm
- Down Fill: 6 oz. (0.18 kg) of 900 Fill Goose Nikwax Hydrophobic Down, RDS (Responsible Down Standard) certified
- Shell material: 10 D (denier) nylon ripstop with DWR (Durable Water Repellent)
- Lining material: 10 D nylon ripstop
The most common question asked about a sleeping bag or quilt is “Will this keep me warm at X temperature?” The ISO/EN rated temperature range, the industry standard for measuring sleeping bag warmth, is printed right on the bag: 45 degrees is the Lower Limit and 52 degrees is the Comfort rating. I’m a cold sleeper who usually adds a few degrees to the stated temp rating of insulation, yet I found this rating to be spot on or even a bit conservative. Wearing just long, lightweight baselayers, at 50-55 degrees in this quilt, I was warm and cozy. At 45 degrees I was cool but could still sleep comfortably. I’ve taken this quilt down to 38 degrees and between that temp and 42 degrees I needed to supplement my insulation. The loft is impressive for such a lightweight quilt.
Premium Materials and Design
The Vesper 45 is one of Therm-a-Rest’s ultralight series of quilts. Besides the 45 degrees version we tested, they also offer a Vesper 32 Quilt and a Vesper 20 Quilt. The 45 degrees quilt is a sewn-through baffle design, while the warmer quilts are box-baffled to eliminate cold spots. However, I found the 45-degree quilt so lofty for its weight, that I didn’t feel the sewn-through areas as cold spots when it was used within its recommended temp range.
All of the Vesper quilts use 900 fill power water-resistant down which has been RDS (Responsible Down Standard) certified to never come from birds that have been force-fed or live-plucked. Its shell and liner fabrics are both 10 denier nylon fabrics that are soft and silky. 10 denier is a more delicate fabric, but a sleeping quilt is a smart place to use this kind of fabric for weight savings.
There are ultralight quilts on the market which save weight with minimal features, but the Vesper manages to keep a 12 ounce weight while maintaining a bunch of features found on much heavier quilts. That’s pretty incredible.
Neck Cinch and Draft-collar
There is a single snap at the neck of the quilt, and a thin drawcord with mini captured cordlock offset from the center to cinch the quilt around your neck. Surprisingly for a quilt of this weight, there is a draft collar at the neck. This helps keep the heat in and is much more comfortable around your neck than a drawcord in an uninsulated fabric tube; with the draft collar you don’t have to cinch the cord as tightly.
Box-shaped Footbox and U-cutout
The Vesper is a sewn-end quilt with a box-shaped footbox that allows the toes of back sleepers to point upwards without being cramped. When you flip the quilt over, the closed footbox opens up to the opening of the quilt with a gentle U-shape. On many quilts, the footbox opens up into a V along a seam, which puts lots of stress at the point of that V and often requires a gusset or other reinforcement to keep the fabric from ripping when you kick your feet in and out. The U-cutout of the Vesper quilt spreads the tension along a much greater area, and not on a seam.
Wide Shoulder Girth
The Vesper 45 quilt is 58” wide at the shoulders, which is wider than many companies’ wide quilts! It tapers down from there to 51” at the hips, and then 37” at the feet. This wide shoulder girth allows you to get great coverage around your torso with room to tuck it under you. I move between my stomach and side sleeping in the night, and I really appreciated this extra girth as I changed positions. This extra width also reduces the quilt’s dependence on a more cumbersome sleeping pad attachment system, since the quilt’s extra width blocks side drafts quite effectively.
Side Draft Tubes
While the quilt does taper down from the wide shoulder girth, it has draft tubes built into the sides that create a barrier for drafts when the quilt is on top of you, and can also be tucked underneath you for more secure draft protection.
SynergyLink Pad Connector Strap
The Vesper 45 comes with a single pad connector strap called a SynergyLink which is a simple elastic strap that goes around a sleeping pad with no adjustability. Thin plastic toggles hook into tiny loops on either side of the quilt, in one of two positions, closer to the chest or closer to the waist. The strap connects not at the very edge of the quilt but rather above the side draft tubes so the draft tubes can tuck in around you.
My first instinct was to use the higher loops (the ones closer to the chest) as there is more quilt to cinch in that area. But I found I vastly preferred connecting the strap at the lower level. When it was connected in the higher position around the sleeping pad, I found that I could no longer snug the quilt tightly around me, one of the best features of a quilt, as it was pinned down to the sides of the pad.
When I connected the strap to the lower level, it was easier to get into and out of the quilt in the night, and kept the quilt tucked into place around my knees. Using the strap at the lower level also allowed me to vary the degree to which I draped or tucked the quilt around the upper part of my body, the feature I had missed in the other position. I’ve used the strap ever since in the lower position, sometimes around a pad, sometimes around my body, and find both of these options work well.
Comparable Off-the-Shelf Warm-Weather Backpacking Quilts
|Make / Model||Weight|
|Therm-a-Rest Vesper 20||19 oz|
|Therm-a-Rest Vesper 32||15 oz|
|Therm-a-Rest Vesper 45||12 oz|
|Hyperlite Mountain Gear 20||20.1 oz|
|Hyperlite Mountain Gear 40||14.4 oz|
|REI Magma Trail 30||19 oz|
|Sea to Summit Cinder 50||16.9 oz|
|Enlightened Equipment Revelation 40 (Stock)||19.8 oz|
The Therm-a-Rest Vesper 45 Quilt is a high-quality, ultralight, and ultracompact quilt that I found to be true to its temperature rating. It’s a great warmer-weather option for backpackers and fastpackers looking to minimize weight and bulk from their kit without minimizing features. There are ultralight quilts on the market which save weight with minimal features, but the Vesper manages to keep a 12-ounce weight while maintaining features found on much heavier quilts through the use of high-quality materials and smart design. If you’re looking to reduce the weight of your backpacking sleep insulation this year, the Therm-a-Rest Vesper 45 deserves serious consideration.
Disclosure: Therm-a-rest donated a quilt for an honest review.SectionHiker is reader-supported. We only make money if you purchase a product through our affiliate links. Help us continue to test and write unsponsored and independent gear reviews, beginner FAQs, and free hiking guides.