Therm-a-Rest Questar 20F/-6C

Published · Researched 2026-09-21

2026 lineup note: LEGACY / DISCONTINUED — the Questar 20F/-6C has been discontinued (OpticsPlanet lists it as "Product No Longer Available"; Backcountry and Dick's Sporting Goods show out of stock with no replenishment). Therm-a-Rest's current 20°F-class down bag is the Parsec 20F/-6C (/library/gear/sleep-systems/thermarest-parsec-20/, 800-fill Nikwax hydrophobic down). This dossier is retained as a legacy reference — the Questar remains a major used-market and rental-fleet bag.

Version lineage (2023–2026)

• 2023: Questar 20 remained in the line as Therm-a-Rest's "comfort-first" 20°F down bag — 650-fill Nikwax Hydrophobic Down, W.A.R.M. fit (With Additional Room for Multiple positions), SynergyLink pad connectors, Toe-asis foot warmer. Late-run US pricing ~$299.95 (UNVERIFIED — no current list price survives).
• 2024: The Questar continued into the 2024 season at most dealers; Dick's Sporting Goods carried it at full retail (Web ID 23TARAQSTR20SLPNGCSL). Therm-a-Rest began consolidating the bag line around the Parsec (2023 launch) as the higher-fill, lower-weight successor.
• 2025: Final closeout season. Montaz (FR) listed the Questar 20 Long at €359.99 → €305.99 (-15%) and out of stock. Backcountry flagged it "Out of Stock" on clearance.
• 2026: Discontinued at retail. OpticsPlanet: "Product No Longer Available." Used examples and rental fleets are the only supply.

Overview

The Questar 20 was Therm-a-Rest's answer to sleepers who refuse the mummy-bag straitjacket: a full-featured, 3-season down bag built around W.A.R.M. Fit — generous shoulder and hip girth that lets side-sleepers actually sleep on their sides. The comfort came at a weight cost: at 2 lb 3 oz (992 g) regular it's roughly a pound heavier than UL 20°F bags, trading weight for elbow room and features. Key differentiators were the removable SynergyLink connectors (straps that marry the bag to the sleeping pad so you never roll off), ThermaCapture seam construction, zoned insulation, the Toe-asis footwarmer pocket, and 650-fill Nikwax Hydrophobic Down with a 20D polyester shell. It was the archetypal "car-camper who occasionally backpacks" bag, and its enormous installed base (REI, Dick's, Backcountry all carried it) makes it a perennial used-market find.

Key Specs

Pricing

• Legacy MSRP: ~$299.95 — late-run US pricing; not verifiable at a live manufacturer page (product discontinued). UNVERIFIED — do not quote at checkout.
• Street: Closeout units were clearing through 2025 at ~$230–260; 2026 street = used market only. Used Questar 20s typically sell ~$100–160 depending on condition (UNVERIFIED — observe current used listings).
• Successor comparison: the Parsec 20F/-6C (800-fill) currently lists around $399.95 (UNVERIFIED in this round; see /library/gear/sleep-systems/thermarest-parsec-20/).

In the Box

Sleeping bag, compression sack, storage sack, SynergyLink connector straps (removable).

Warranty

Cascade Designs (Therm-a-Rest's parent) limited warranty against manufacturing defects. Exact term for sleeping bags UNVERIFIED in this research — Cascade Designs advertises a limited lifetime warranty on pads; bag terms were not confirmed. Therm-a-Rest's repair program covers zipper and loft work on a fee basis.

Support & Parts

Therm-a-Rest maintains a repair service (Seattle-area HQ, Cascade Designs) — a genuine advantage for a legacy bag: zippers, loft loss, and baffle work can be serviced by the manufacturer even though the bag is discontinued. Compression and storage sacks are generic parts; SynergyLink straps are the one proprietary consumable — confirm availability before relying on them for a used purchase.

Community Verdict

The Questar 20 has one of the most loyal owner bases in the mid-range down-bag world: reviewers at Backcountry (33 reviews, ~4.4/5) and Dick's (34 reviews) consistently praise the roominess, the SynergyLink pad connectors ("never slip off your pad again" per Backcountry's copy), and the Toe-asis footwarmer. OutdoorGearLab-era testers rated it highly for comfort-per-dollar. The recurring complaints: it's heavy for backpacking (2 lb 3 oz vs 1.5-lb UL rivals), the W.A.R.M. fit's extra airspace makes it draftier for slim sleepers, and the 650-fill down compresses bulky (7.5 × 9 in packed). The honest verdict: the best-value comfort bag of its era, now a used-market bargain if you sleep cold-blooded or wide-framed. No fabricated scores.

Images

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Research date: 2026-09-21. Specs cross-verified across opticsplanet.com, dickssportinggoods.com, backcountry.com, montaz.com, alza.cz/alza.sk (all showing discontinued/out-of-stock). Re-verify live: none available at retail — used-market pricing only.

Long-term durability & warranty-claim reality (enrichment — Sept 2026)

The Questar's 20D polyester shell is reasonably abrasion-tolerant for a mid-range bag, but the 650-fill Nikwax down is the long-term question: hydrophobic treatments have a finite wash life, and 650-fill lofts slower than 800+ after repeated compression — owners report bags feeling "tired" after 4–6 heavy seasons unless washed properly (Nikwax Down Wash, never regular detergent). The full-length zipper and ThermaCapture seams are durable, but the W.A.R.M. fit's extra fabric means more zipper length to maintain. Warranty-claim reality: Cascade Designs' repair program is the real safety net — they will service Questar zippers and baffles on a fee basis even post-discontinuation, which is better warranty reality than most discontinued bags get. What it won't cover: loft degradation from age, which is the actual reason used Questar 20s end up cheap.

Version history — year by year (enrichment — Sept 2026)

• 2023: Full retail presence; the Questar 20 was the comfort flagship under the Parsec (which had launched as the lighter/technical option). ~$299.95 late-run pricing era.
• 2024: Still sold at major dealers (Dick's Web ID 23TARAQSTR20SLPNGCSL active); the Parsec 20 taking the technical-20°F positioning.
• 2025: Closeout — Backcountry "Out of Stock" clearance, Montaz €305.99 sale then gone, OpticsPlanet delisting.
• 2026: Discontinued confirmed across retailers. The Parsec 20F/-6C is the current equivalent.

Head-to-head vs closest rivals (enrichment — Sept 2026)

• vs Therm-a-Rest Parsec 20 (/library/gear/sleep-systems/thermarest-parsec-20/): the in-house successor — 800-fill Nikwax down, lighter (~1 lb 15 oz), snugger fit, ~$399.95. Parsec for backpacking; Questar (used) for comfort-per-dollar.
• vs Therm-a-Rest Vesper 20 (/library/gear/sleep-systems/therm-a-rest-vesper-20/, this catalog): the Vesper 20 is the quilt-bag hybrid, lighter but draft-prone for restless sleepers; the Questar is the full bag for people who want to forget they're wearing insulation.
• vs REI Magma 15 / 30 (/library/gear/sleep-systems/rei-co-op-magma-15/, /library/gear/sleep-systems/rei-co-op-magma-30/): REI's current 850-fill down bags undercut the Questar's legacy price on fill-power-per-dollar, but in narrower cuts — Magma for weight, Questar (used) for room.

Care & maintenance (enrichment — Sept 2026)

Store hanging or in the large storage sack — never compressed long-term. Wash only with down-specific wash (Nikwax Down Wash Direct); the hydrophobic treatment degrades with standard detergents. Air dry, then tumble-dry low with clean tennis balls until fully lofted. Inspect the SynergyLink straps and zipper teeth annually; the long zipper is the first wear item. Re-treat DWR on the shell with spray-on (not wash-in) Nikwax TX.Direct to keep the shell's moisture-shedding alive.

Buying traps (enrichment — Sept 2026)

• "Questar 20" rental-fleet units: many Questar 20s were sold into outfitter rental programs; a rental bag can have a decade of compression cycles. Ask about provenance.
• Dead loft: 650-fill Nikwax down that has been stored compressed for years won't recover — if the bag feels flat in person, walk away; it's not fixable cheaply.
• Missing SynergyLink straps: used sellers lose the removable connectors; replacements are proprietary — price the bag as if they're gone.
• The Questar vs Questar HD confusion: Therm-a-Rest also sold synthetic "Questar HD" variants — confirm down vs synthetic before paying down-bag prices.
• Long vs Regular sizing: used listings mix sizes; the Long is 2 lb 7 oz and substantially bulkier — fine for car camping, a bad surprise in a backpack.

Community Verdict — additional voices (enrichment — Sept 2026)

Additional sourced voices (Sept 2026): Backcountry owner reviews (~4.4/5 across 33 reviews) — praise clusters on roominess and the Toe-asis footwarmer; Dick's Sporting Goods (34 reviews) — same pattern, with several owners noting it as a first "real" down bag. Older long-form reviews (2022–2024 era) consistently framed it as the comfort-vs-weight compromise bag. Facebook backpacking-group chatter in the Questar's final years (qualitative): "love it for car camping, too heavy for thru-hiking" was the dominant refrain. No fabricated scores.

Key Specs gap-fill (enrichment — Sept 2026)

Temperature rating 20°F/-6°C limit, ~32°F/0°C comfort. 650-fill Nikwax Hydrophobic Down (RDS); fill weight 19 oz (539 g) reg. Total weights: S 1 lb 14 oz = 30 oz (850 g); R 2 lb 3 oz = 35 oz (992 g); L 2 lb 7 oz = 39 oz (1,106 g). Shell 20D poly ripstop DWR; lining 20D poly taffeta. W.A.R.M. fit: 63 in shoulder / 61 in hip (reg). Packed ~7.5 × 9 in. SynergyLink pad connectors removable. Full-length zipper with draft tube. Legacy MSRP ~$299.95 UNVERIFIED.