The Best Underquilts for Hennessy Hammocks
A Hennessy is asymmetric and bottom-entry, which changes the under-insulation question. Hennessy's own answer is not a quilt at all.
By Mike M. · Last updated
Knot & Nap is reader-supported. We earn from qualifying purchases as an Amazon Associate, at no extra cost to you. Commissions never decide what gets recommended — here is how we pick.
For a Hennessy, start with Hennessy's own SuperShelter — system #2 for the Explorer and Survivor bodies at 26.4 oz, system #1 for the Expedition and Ultralite Backpacker at 22.4 oz. It is the only under-insulation with a published fit. For a conventional hanging quilt instead, the Hammock Gear Incubator.
Part of our hammock gear hub. A Hennessy is not a plain gathered-end hammock. The body is cut asymmetrically around a diagonal lay, you enter through the bottom, and the whole design assumes an insulation layer that works with that geometry rather than around it.
Quick picks
Tap any row to jump to the full write-up. Prices are not shown anywhere on this site — we link straight to Amazon so you see the live figure.
| # | Product | Best for | Headline spec | Price |
|---|---|---|---|---|
| 1 |  Hennessy SuperShelter 4-Season Insulation System #2The larger SuperShelter, cut for the Explorer and Survivor bodies: the same three-part system with four more ounces of material. | Explorer Deluxe and Survivor | Hennessy lists compatibility with the Explorer Deluxe Classic, Explorer Deluxe ZIP, Explorer Ultralite Classic, Explorer Ultralite ZIP, Survivor Classic and Survivor ZIP | |
| 2 | Hennessy SuperShelter 4-Season Insulation System #1Hennessy's own under-insulation, sized to the Expedition and Ultralite Backpacker bodies, and the only insulation with a published fit for them. | Expedition and Ultralite Backpacker | Hennessy lists compatibility with the Expedition Classic, Expedition ZIP, Hyperlite ZIP, Ultralite Backpacker Classic and Ultralite Backpacker ZIP | |
| 3 | Hammock Gear Incubator Underquilt850-fill down in five temperature ratings and three lengths, which is the closest this category gets to a quilt cut for your body and your season. | Best backpacking underquilt | Temperature ratings 40F, 30F, 20F, 10F and 0F | |
| 4 | Onewind Hammock UnderquiltOnewind's standard underquilt range, rated 35–50°F and 45–70°F depending on the model you pick. | Three-season warmth | Temperature ratings from 35°F to 50°F (2°C to 10°C) and 45°F to 70°F (7°C to 21°C) depending on model | |
| 5 | Hennessy Heat Reflecting Double Bubble Pad XLA reflective double-bubble pad cut to the XL Hennessy shape: the cheapest published-fit fix for a cold back. | The least you can spend | Heat-reflecting double bubble construction | |
| 6 | OneTigris Hideout Hammock UnderquiltThe budget benchmark: a full-length quilt that publishes its temperature band, its fill weight and its packed size, which most cheap quilts never do. | Best cheap underquilt | Rated 41F to 68F (5C to 20C) |
#ad — the buy links above are affiliate links. See our affiliate disclosure.
Hennessy's own systems, and what fits what
| Insulation | Fits | Packed weight | What it is |
|---|---|---|---|
| SuperShelter #1 | Expedition Classic and ZIP, Hyperlite ZIP, Ultralite Backpacker Classic and ZIP | 22.4 oz / 635 g | UnderCover, foam UnderPad, mylar blanket |
| SuperShelter #2 | Explorer Deluxe Classic and ZIP, Explorer Ultralite Classic and ZIP, Survivor Classic and ZIP | 26.4 oz / 748 g | UnderCover, foam UnderPad, mylar blanket |
| Double Bubble Pad | Expedition, Scout, Hyperlite, Ultralite Backpacker, Cub, Deep Jungle ZIP | Not published | Reflective pad, inside the hammock |
| Double Bubble Pad XL | Explorer Deluxe, Explorer Ultralite, Safari Deluxe, Survivor, Jungle Explorer, Deep Jungle XL | Not published | Reflective pad, inside the hammock |
The important column is the first one. Hennessy sells these by hammock model, not by size, and the Classic and ZIP versions of the same hammock take different items. Read your hammock's exact name off the stuff sack before ordering — Explorer Deluxe Classic and Explorer Deluxe ZIP are not interchangeable here.
1. Explorer Deluxe and Survivor
Hennessy SuperShelter 4-Season Insulation System #2
The larger SuperShelter, cut for the Explorer and Survivor bodies: the same three-part system with four more ounces of material.
Specifications
- Hennessy lists compatibility with the Explorer Deluxe Classic, Explorer Deluxe ZIP, Explorer Ultralite Classic, Explorer Ultralite ZIP, Survivor Classic and Survivor ZIP
- UnderCover, open-cell foam UnderPad and radiant mylar blanket
- Packed weight 26.4 oz / 748 g for the Explorer Zip and Survivor Zip fit
- UnderPad is 1/2 in (1.25 cm) open-cell foam, contoured to the asymmetric cut
Source: hennessyhammock.com SuperShelter #2 product pages, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- The under-insulation Hennessy publishes as fitting the Explorer Deluxe family, including the XL
- Windproof silnylon cover blocks the draft that gets under a hanging quilt
- Removable without unhanging the hammock
Where it falls short
- No published temperature rating or R-value
- 26.4 oz is close to a full down underquilt for a less adjustable system
- Classic and ZIP fits are separate items
Illustrative photograph of the category, not this exact product.
2. Expedition and Ultralite Backpacker
Hennessy SuperShelter 4-Season Insulation System #1
Hennessy's own under-insulation, sized to the Expedition and Ultralite Backpacker bodies, and the only insulation with a published fit for them.
Specifications
- Hennessy lists compatibility with the Expedition Classic, Expedition ZIP, Hyperlite ZIP, Ultralite Backpacker Classic and Ultralite Backpacker ZIP
- Comprises a silnylon UnderCover, an open-cell foam UnderPad and a radiant heat-reflecting mylar space blanket
- UnderPad is 1/2 in (1.25 cm) open-cell foam, contoured to the hammock's asymmetric shape
- Packed weight 22.4 oz / 635 g for the Expedition and Backpacker fit
- Packed size 5 in diameter x 15 in
Source: hennessyhammock.com SuperShelter #1 product pages, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- Fit is a published compatibility list, not a guess from dimensions
- The UnderCover can be fitted or removed without taking the hammock down
- The trapped airspace between cover and hammock does a job no hanging quilt does
Where it falls short
- Hennessy publishes no temperature rating and no R-value for it
- Classic and ZIP versions are different products, and ordering the wrong one is the classic mistake
- An UnderPad plus an UnderCover is more parts to rig than a single quilt
Illustrative photograph of the category, not this exact product.
3. Best backpacking underquilt
Hammock Gear Incubator Underquilt
850-fill down in five temperature ratings and three lengths, which is the closest this category gets to a quilt cut for your body and your season.
Specifications
- Temperature ratings 40F, 30F, 20F, 10F and 0F
- 850 fill-power ethically sourced down
- 7-denier, 10-denier and 20-denier ripstop shell options with a DWR coating
- Lengths: Short for 5 ft 2 in to 5 ft 7 in, Standard for 5 ft 7 in to 6 ft 2 in, Long for 6 ft 2 in to 6 ft 7 in
- Hammock Gear states a 40F model stuffs to roughly 4.5 liters and a 20F model to about 8.5 liters
Source: hammockgear.com Incubator product page, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- Rating, length and shell denier are chosen at order time rather than fixed
- 850 fill is the highest fill power we track, so it is the smallest packed size per degree
- Three lengths means no dead insulation hanging past your calves
Where it falls short
- Made to order from a cottage brand, so it ships in weeks rather than days
- Per-rating weights are not published on the product page
- Down under a hammock sits exactly where condensation collects
Illustrative photograph of the category, not this exact product.
4. Three-season warmth
Onewind Hammock Underquilt
Onewind's standard underquilt range, rated 35–50°F and 45–70°F depending on the model you pick.
Specifications
- Temperature ratings from 35°F to 50°F (2°C to 10°C) and 45°F to 70°F (7°C to 21°C) depending on model
Source: onewindoutdoors.com, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- Two rating bands means you can match the quilt to your actual season
- Underquilts beat sleeping pads for hammock insulation
Where it falls short
- You have to read carefully to buy the right band
- Fill weight is not published per model
Illustrative photograph of the category, not this exact product.
5. The least you can spend
Hennessy Heat Reflecting Double Bubble Pad XL
A reflective double-bubble pad cut to the XL Hennessy shape: the cheapest published-fit fix for a cold back.
Specifications
- Heat-reflecting double bubble construction
- Hennessy lists the XL as fitting the Deep Jungle ZIP XL, Explorer Deluxe Classic and ZIP, Explorer Ultralite Classic and ZIP, Jungle Explorer ZIP, Jungle Safari ZIP, Safari Deluxe Classic and ZIP, Survivor Classic and Survivor ZIP
- A standard-size version covers the Expedition, Scout, Hyperlite and Ultralite Backpacker bodies
Source: hennessyhammock.com insulation collection, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- The cheapest published-fit insulation Hennessy sells
- Goes inside the hammock, so there is nothing to tension or seal
- Doubles as a ground sheet on a night you end up on the floor
Where it falls short
- A pad inside the hammock crinkles and slides in a way a hanging quilt does not
- No temperature rating or R-value is published
- Shoulder and hip coverage is narrower than an underquilt's
Illustrative photograph of the category, not this exact product.
6. Best cheap underquilt
OneTigris Hideout Hammock Underquilt
The budget benchmark: a full-length quilt that publishes its temperature band, its fill weight and its packed size, which most cheap quilts never do.
Specifications
- Rated 41F to 68F (5C to 20C)
- 1.7 lb / 770 g
- Unfolded 9.2 ft x 4 ft (2.8 m x 1.2 m)
- 700 g polyester fill
- 210T Terylene shell with a 300T polyester pongee lining
- Packs to 13 in x 6.8 in (33 cm x 17 cm)
- Bungee cord loops and two carabiners included
Source: camping.onetigris.com Hideout underquilt product page, 2026. We publish specs we can attribute and leave the rest blank rather than assuming a typical value.
What it does well
- Publishes fill weight, packed size and shell fabric, which is rare at this end of the market
- 9.2 ft of length covers an 11 ft hammock end to end
- Bungee suspension and carabiners in the box, so there is nothing else to source
Where it falls short
- 41F at the bottom of its range is a shoulder-season quilt, not a winter one
- 13 x 6.8 in packed is bulky next to a down quilt
Illustrative photograph of the category, not this exact product.
Why the SuperShelter is not a quilt
It is three things working together: a windproof silnylon UnderCover that clips beneath the hammock, a contoured half-inch open-cell foam UnderPad that sits between the cover and the hammock body, and a radiant mylar blanket. The cover traps a layer of still air, the pad adds loft where your weight would otherwise crush it, and the mylar reflects radiant heat back up. It is a different mechanism from a hanging down quilt and it addresses the same problem.
The honest caveat, and Hennessy's own material does not hide it: there is no published temperature rating and no R-value for the system. That is unusual for a piece of insulation and it makes direct comparison with a rated quilt impossible. What you can compare is weight and fit, and on both counts it is competitive.
When a third-party quilt is the better answer
- You want a temperature rating. Hammock Gear publishes 40F down to 0F on the Incubator; Hennessy publishes nothing.
- You are going properly cold. A 0F down quilt is a different class of insulation from a half-inch foam pad.
- You own more than one hammock. A hanging quilt moves between them; a SuperShelter does not.
- You want to spend less. The OneTigris Hideout publishes 41F to 68F at 1.7 lb and 9.2 ft of length, which covers a Hennessy body end to end.
Fitting a hanging quilt to an asymmetric hammock
It works, with one adjustment. A Hennessy hangs with a pronounced diagonal, so the point where your shoulder presses down is not on the hammock's center line. Rig the quilt slightly off-axis to follow your actual lay rather than the hammock's seam, and tension the head end harder than you would on a symmetric hammock. A full-length quilt of 8 ft or more gives you room to do that — the Onewind full-length quilt measures 82 in by 52 in and is explicitly sold as fitting Hennessy bodies among others.
What we would buy
- Explorer Deluxe or Survivor owners: SuperShelter #2, at 26.4 oz with a published fit.
- Expedition or Ultralite Backpacker owners: SuperShelter #1, at 22.4 oz.
- Cold weather: Hammock Gear Incubator in a 20F or 10F rating, rigged off-axis.
- Spending as little as possible: the Double Bubble Pad in the size Hennessy lists for your model.
- A quilt that also fits your other hammock: the Onewind full-length, or the OneTigris Hideout.
Common questions
What underquilt fits a Hennessy hammock?
Hennessy's own SuperShelter systems are the only under-insulation with a published, model-by-model fit — system #1 for the Expedition and Ultralite Backpacker, system #2 for the Explorer and Survivor. Full-length third-party quilts of 8 ft or more also fit, rigged to follow the diagonal lay.
Does the Hennessy SuperShelter have a temperature rating?
No. Hennessy publishes packed weights and a compatibility list but no temperature rating and no R-value for the SuperShelter. That is worth knowing before you compare it with a quilt that publishes 20F or 0F.
What is the difference between SuperShelter #1 and #2?
Size and fit. System #1 is cut for the Expedition, Hyperlite and Ultralite Backpacker bodies and packs at 22.4 oz; system #2 is cut for the Explorer Deluxe, Explorer Ultralite and Survivor and packs at 26.4 oz. Each comes in a Classic and a ZIP version.
Can you use a normal underquilt with a bottom-entry hammock?
Yes, but plan the sequence. A quilt slung underneath sits across the entry slit, so hang and fit the quilt before you need to get in, or choose a system such as Hennessy's UnderCover that is designed to be removed without unhanging the hammock.
Do you need an underquilt with a Hennessy, or is a pad enough?
A pad is enough for mild nights and Hennessy sells reflective Double Bubble pads cut to its own shapes. Below roughly 50F most people want either the SuperShelter or a rated hanging quilt — see underquilt vs sleeping pad.
Sources
Every specification on this page traces to one of these. Where a recommendation rests on another publication's hands-on testing, we name it — we do not run a test lab.
Read next
Spotted something we got wrong? Tell us — corrections are part of our editorial policy.