This guide compares 10 underquilts across 5 expert sources, with warmth-per-ounce efficiency calculated for each.
The key takeaway: the price gap between the cheapest ($119) and most expensive ($345) underquilt is $226.
But the warmth-per-ounce difference is only 15%.
Most buyers overspend because no guide shows them that number.
65–70% of your body heat escapes through the bottom of your hammock.
Your underquilt isn't an accessory.
It's your primary insulation system — more important than your sleeping bag.
What You'll Learn in This Guide
- ✓ Why 65–70% of body heat escapes downward (and why your sleeping bag can't fix it)
- ✓ The °F-per-ounce efficiency metric that reveals which underquilts are actually worth the price
- ✓ A full comparison table of 10 underquilts with prices ($119–$345), weights (10.5–33 oz), and temp ratings
- ✓ Down vs. synthetic: exact weight, warmth, and cost trade-offs with numbers
- ✓ A clear IF/THEN decision framework based on your camping temperature
- ✓ 6 specific scenarios — find yours and get a concrete recommendation
- ✓ The layering trick that extends your underquilt range by 20°F without buying a second one
Quick Answer
If you camp above 50°F only → Skip the underquilt. Use a ⅛" foam pad.
If you camp 30–50°F on a budget → Choose the Arrowhead Jarbidge River ($119, synthetic, 25°F, 20 oz).
If you backpack in 20–40°F → Choose a ¾-length 800-fill down quilt like the Hammock Gear Phoenix ($180, 14–18 oz).
If you camp below 30°F or sleep cold → Choose a full-length 850-fill down quilt like the Warbonnet Wooki ($230) or Enlightened Equipment Revolt ($265+).
Still unsure? → A 20°F down underquilt is the most popular "do-everything" choice across all sources.
The Number That Changes Everything: 65–70% Heat Loss
According to Hammock Gear's engineering data, 65–70% of your body heat escapes through the bottom of your hammock.
Straight through the thin fabric underneath you.
Your sleeping bag doesn't fix this.
Your body weight crushes the insulation underneath you to near-zero thickness — no loft, no warmth.
Why Sleeping Pads Don't Cut It Either
A sleeping pad inside a hammock is a compromise.
Warbonnet Outdoors puts it directly: inflatable pads "buckle, bend, and poke near your hips" in end-gathered hammocks.
A 25-inch-wide pad leaves your sides exposed to cold air.
Underquilts wrap 40+ inches of uncompressed insulation beneath you — no gaps, no shifting.
Bottom line: Your underquilt IS your insulation system. Your sleeping bag and top quilt are supplemental.
New to hammock camping? Start with our complete setup guide or the hammock vs. tent comparison.
The Data: 10 Underquilts Compared
Full Comparison Table
°F/oz = temperature rating ÷ weight. Higher = more warmth per ounce of pack weight.
How to Read the Efficiency Number
Use this number as a shortcut.
It tells you how much temperature protection each ounce of carried weight buys.
That matters most when two quilts have similar temperature ratings but very different pack weights.
What the Efficiency Numbers Reveal
The Outdoor Vitals StormLoft leads at 1.43 °F/oz.
Each ounce of pack weight buys you 1.43 degrees of cold protection.
The ENO Blaze? 1.15 °F/oz.
You're carrying 12 more ounces for the same 30°F rating as the Hammock Gear Incubator.
The pattern: 850-fill down consistently delivers 15–25% better efficiency than 750-fill or synthetic.
Expert reports from Greenbelly and My Open Country show the same split between lighter premium down quilts and heavier budget synthetic options.
But here's the surprise.
The budget Arrowhead Jarbidge River (synthetic, $119) matches the premium Hammock Gear Phoenix at 1.25 °F/oz.
It just weighs 4 oz more.
Down vs. Synthetic: The Real Trade-offs
Every underquilt guide says "down is lighter, synthetic is cheaper."
Here are the actual numbers:
Head-to-Head Comparison
When to Choose Synthetic
- Your budget is under $150
- You camp primarily in rain or high humidity (Southeast US, Pacific Northwest winter)
- You want zero-maintenance gear (no special washing, no loft-restoring)
- This is your first underquilt and you're testing whether hammock camping suits you
When to Choose Down
- You backpack and every ounce matters
- You camp in dry or cold-and-dry conditions (Western US, winter above treeline)
- You plan to use this underquilt for 5+ years
- You're willing to invest in a dry bag and proper storage to protect loft
Full-Length vs. ¾-Length: When the Extra 20 Inches Matters
Above 30°F? ¾-length saves 5–10 oz and $30–80 with no comfort penalty.
Below 30°F? Full-length. Your feet and head lose heat fast when exposed.
Only one underquilt budget? Buy full-length at 20°F. It covers all seasons — vent it open in summer.
The IF/THEN Decision Framework
Don't overthink this. Answer two questions:
Question 1: What's Your Coldest Camping Temperature?
Question 2: What's Your Priority?
6 Scenarios: Find Yours
Scenario 1: Budget First-Timer (Testing Hammock Camping)
Verdict: Arrowhead Jarbidge River — $119, synthetic, 25°F, 20 oz
You fit this if:
- ✓ This is your first underquilt purchase
- ✓ Your budget is under $150
- ✓ You camp spring through fall (not deep winter)
- ✓ You want something that works if it gets wet
- ✓ You're not sure hammock camping is for you yet
At $119, the Jarbidge River costs less than most budget sleeping bags.
Synthetic fill means no dry bag needed. Toss it in a stuff sack still damp — it keeps working.
The 25°F rating covers 3-season use in most of the US.
At 20 oz it's heavier than down.
But for a first underquilt, paying $110 less is the right call.
Especially when you're still testing whether hammock camping sticks.
Shopping checklist:
- Arrowhead Jarbidge River ($119) or similar synthetic 25–30°F underquilt
- Verify your hammock length — 58" underquilt fits users under 6'0"
- Budget $0 extra for maintenance (synthetic needs no special care)
Scenario 2: 3-Season Backpacker (Weight Matters)
Verdict: Hammock Gear Econ Phoenix — ~$180, 800-fill down, 20°F, 16 oz
You fit this if:
- ✓ You hike 5+ miles to camp
- ✓ Every ounce in your pack matters
- ✓ You camp March through November
- ✓ You generally sleep warm
- ✓ You're willing to use a dry bag for the underquilt
The ¾-length design (54") saves 5–10 oz over full-length.
It still covers shoulders to calves.
At 16 oz and $180, it hits the sweet spot of weight, warmth, and price.
The 800-fill down packs to roughly 5 liters.
The full-length Incubator from the same brand weighs 21.6 oz.
That extra 5.6 oz is a full water bottle on a 3-day trip.
Shopping checklist:
- Hammock Gear Econ Phoenix 20°F ($180)
- Dry bag or waterproof stuff sack (4L, ~$12)
- Plan to supplement with a beanie + insulated socks below 25°F (exposed head/feet with ¾-length)
- Consider a Hammock Topquilt Poncho to complete the insulation system
Scenario 3: Winter Hammock Camper (Below 20°F)
Verdict: Warbonnet Wooki 20°F — $230, 850-fill down, 18 oz, 76" full-length
You fit this if:
- ✓ You camp in conditions below 20°F
- ✓ You accept spending $200+ for proper cold-weather gear
- ✓ You need full head-to-toe coverage
- ✓ You have experience with down gear care
The Wooki's 850-fill down delivers the best warmth-to-weight ratio in its price tier.
At 76" full-length, it wraps past your head and feet.
That matters below 20°F, when extremity heat loss accelerates.
Warbonnet also makes the Blackbird and Eldorado hammocks.
Their underquilts fit end-gathered hammocks precisely.
For extreme cold (0°F to -20°F), the Wooki comes in colder ratings.
Wet-winter alternative: The Enlightened Equipment Revolt ($285 at 20°F) uses DownTek water-resistant treatment.
It's worth it if condensation soaks standard down.
Shopping checklist:
- Warbonnet Wooki 20°F ($230) or EE Revolt 20°F ($285)
- Waterproof stuff sack (6L)
- Underquilt protector to prevent condensation damage on low hangs
- Top quilt rated 10–20°F warmer than your underquilt (e.g., 20°F underquilt + 30–40°F top quilt — your top side loses heat slower)
Scenario 4: Summer-Only / Hot Sleeper
Verdict: OneTigris Night Protector — $45–60, synthetic, 40–68°F, 27 oz
You fit this if:
- ✓ You only camp May through September
- ✓ Nighttime lows stay above 50°F
- ✓ You sleep warm and don't need heavy insulation
- ✓ You want the cheapest functional underquilt
You don't need 20°F of protection for summer camping.
The Night Protector blocks wind chill — the real enemy above 50°F.
At under $60, it handles the summer window where you just need something between you and the breeze.
Alternative: A ⅛" closed-cell foam pad ($15) works for nights above 60°F and weighs 2–4 oz.
Scenario 5: Bridge Hammock Owner
Verdict: Sleeping pad OR bridge-specific underquilt — both work equally well
You fit this if:
- ✓ You use a bridge hammock (Warbonnet Ridgerunner, Onewind Bridge Hammock, or similar)
- ✓ You want to know whether standard underquilts fit
Bridge hammocks have a flat sleeping surface.
Pads don't buckle or shift like they do in end-gathered hammocks.
Warbonnet confirms Ridgerunner users "can use an underquilt or a pad with equal ease, convenience, and comfort."
You can use a standard inflatable sleeping pad (R-value 3.0+, ~$80).
That lets you skip the underquilt entirely.
Or use a bridge-specific underquilt for maximum warmth.
Shopping checklist:
- If using a pad: inflatable pad with R-value 3.0+ for 3-season, 5.0+ for winter
- If using an underquilt: verify dimensions match your bridge hammock width (typically wider than end-gathered)
- Onewind bridge owners: the Bridge Hammock Underquilt is designed for flat-surface fit
Scenario 6: Upgrading from a Sleeping Pad
Verdict: Switch to an underquilt when you camp below 50°F more than twice per season
You fit this if:
- ✓ You currently use a sleeping pad in your hammock
- ✓ You wake up cold or shift to re-center the pad at night
- ✓ You're ready to invest in dedicated hammock insulation
Warbonnet notes cold symptoms start as high as the high 60s°F without bottom insulation.
If you camp below 50°F regularly, and your pad leaves cold spots along your sides, an underquilt eliminates both problems.
No shifting. No gaps. No compression.
The budget path: Don't jump straight to a $300 down underquilt.
Start with the Arrowhead Jarbidge River ($119, synthetic, 25°F).
If hammock camping sticks after a full season, upgrade to down.
Your synthetic becomes your backup or loaner.
The Layering Trick: Extend Your Underquilt by 20°F
No guide covers this.
But experienced cold-weather hammock campers do it routinely.
Layer a lighter underquilt with a foam pad to extend your temperature range — without buying a second underquilt.
How it works:
- Take your 40°F underquilt
- Add a ⅜" closed-cell foam pad inside the hammock underneath you
- The foam provides R-1.5 to R-2.0 of additional insulation
- Combined system handles ~15–20°F
The foam pad doesn't compress under your weight.
Closed-cell foam behaves differently from an inflatable pad here.
It supplements the underquilt's air gap with a second insulation layer.
Warbonnet's foam pad thickness ladder confirms the idea.
⅜" foam alone handles "cooler weather down to freezing."
Cost of layering system: $119 synthetic underquilt + $15 foam pad = $134 total.
That gives you a system covering 20–68°F.
A single down underquilt covering that range costs $230–$345.
Protect Your Investment: Underquilt Protectors
One accessory nobody mentions: an underquilt protector.
This thin shell hangs beneath your underquilt and shields it from:
- Ground abrasion on low hangs (your underquilt can brush rocks, sticks, and dirt)
- Condensation moisture rising from damp ground
- Tree sap and debris dropping from above
Down underquilts lose loft permanently when the fill absorbs moisture and clumps.
An underquilt protector adds 3–5 oz.
It also prevents the #1 cause of premature down degradation.
At $29–$39, it's the cheapest insurance for a $200+ down underquilt.
Common Mistakes (And How to Avoid Them)
Mistake 1: Buying by Temperature Rating Alone
What happens: You buy a 20°F underquilt and shiver at 25°F.
Why: Temperature ratings vary by manufacturer.
"20°F comfort" at Hammock Gear means something different than "20°F limit" at a budget brand.
Comfort ratings assume average metabolisms. Cold sleepers need 10°F of buffer.
How to avoid: Buy an underquilt rated 10°F colder than your expected low.
Camp to 30°F → buy 20°F. Camp to 20°F → buy 10°F or 0°F.
Mistake 2: Using a Sleeping Bag Instead of an Underquilt
What happens: You zip into a 20°F mummy bag and still wake up cold at 40°F.
Why: Your body weight compresses bottom insulation to near-zero thickness.
A 20°F sleeping bag becomes a 50°F sleeping bag on the bottom half. 65–70% of heat loss is downward.
How to avoid: An underquilt + top quilt system replaces the sleeping bag entirely.
The underquilt handles the bottom insulation.
The top quilt handles the top.
Combined weight is often less than a mummy bag.
Mistake 3: Skipping a Dry Bag for Down
What happens: Your 800-fill down underquilt gets wet in your pack during a rainstorm.
Wet down loses 60–80% of its insulating value. Takes 4–8 hours to dry in the field.
How to avoid: Pack your down underquilt in a waterproof dry bag or stuff sack ($12, 1–2 oz).
Treat that as non-negotiable.
DownTek-treated fills absorb 30% less moisture — but don't replace waterproof storage.
Mistake 4: Buying ¾-Length for Winter
What happens: Your feet and head get cold below 25°F.
The ¾-length quilt (54–58") only covers shoulders to calves.
Why: Heat loss from your head and feet accelerates below freezing.
A beanie and socks help.
They don't match 850-fill down coverage.
How to avoid: Below 30°F → buy full-length (74–82"). Use ¾-length only for 3-season backpacking above 30°F.
Mistake 5: Ignoring Underquilt Fit for Your Hammock Type
What happens: You buy a standard underquilt for a bridge hammock and it doesn't sit right.
Why: End-gathered hammocks curve at the ends.
Underquilts match that curve.
Bridge hammocks are flat.
A bridge hammock can use a pad or underquilt equally.
An end-gathered hammock needs an underquilt because pads buckle at the hips.
How to avoid: Check your hammock type first.
End-gathered (Onewind 11ft Camping Hammock, ENO, Warbonnet Blackbird) → underquilt.
Bridge (Onewind Bridge Hammock, Warbonnet Ridgerunner) → underquilt or pad.
The Bottom Line
Your underquilt is your primary insulation system.
Not your sleeping bag. Not your top quilt. Not your pad.
65–70% of heat loss goes downward through your hammock fabric.
Compressed insulation can't stop it.
The decision is simpler than every comparison guide makes it:
IF you camp above 50°F → foam pad, skip the underquilt.
IF you camp 30–50°F on a budget → Arrowhead Jarbidge River, $119, synthetic.
IF you backpack in 20–40°F → Hammock Gear Phoenix, ~$180, ¾-length down.
IF you camp below 30°F → Warbonnet Wooki ($230) or EE Revolt ($285), full-length 850-fill down.
IF you want to stretch one underquilt across all seasons → layer a 40°F underquilt + ⅜" foam pad to reach ~15°F for $134 total.
Your Next Move
Budget path ($119–$134):
→ Arrowhead Jarbidge River ($119, synthetic, 25°F)
→ Add a ⅜" foam pad ($15) to extend range to ~15°F
→ Protect with an underquilt protector ($29) to extend lifespan
Performance path ($180–$230):
→ Hammock Gear Phoenix ($180, ¾-length, 800-fill, 20°F) for backpacking
→ Or Warbonnet Wooki ($230, full-length, 850-fill, 20°F) for all-season
→ Pack in a waterproof dry bag ($12)
→ Add an underquilt protector ($29) for down longevity
Already own a Onewind hammock?
→ Our Flare Hammock Underquilt OD Green is the closest current Onewind match for 3-season use
→ For colder trips, browse the Underquilt Collection and match the rating to your actual overnight lows
→ Bridge hammock owners: our Bridge Hammock Underquilt is designed to fit the flat sleeping surface
Sources: Greenbelly Meals, Warbonnet Outdoors, Hammock Gear, My Open Country, DutchWare Gear. Efficiency calculations by Onewind editorial team.
