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CURRENT EDITION
MARKET NOTE
Comfort—not the model-name temperature or lower limit—is the conservative number for cold sleepers. ISO/EN ratings make comparison possible only with an adequate sleeping pad. Honest value clusters around US$280–400: 600–700 FP down or robust synthetic fill, usually with a weight/bulk penalty. Around US$550–600 should buy a measurable gain: 850–900 FP down, materially lower weight, box/zoned baffl
5 PRODUCTS · RANKED
House priorities favor construction, performance, and value.
Current top recommendation: Therm-a-Rest Parsec 0F/-18C.
| Criterion · priority | 01 Therm-a-RestParsec 0F/-18C$570 | 02 Sea to SummitSpark 15$549 | 03 PajakCore 400$342 | 04 First AscentIce Breaker Down Sleeping Bag Large$336 | 05 JR GearHelium Down 750$288 |
|---|---|---|---|---|---|
| Thermal TruthPriority 1 | 9.6EN comfort -10°C; limit -18°C. | 8.7Independent testing reports 29°F comfort and warmth on 20–25°F nights. | 8.4Retailer specifies 0°C comfort and -6°C limit. | 8.6ISO 23537-tested; comfort -3°C. | 9.0EN 13537: comfort -3°C, limit -9°C; field review calls comfort accurate. |
| Insulation EfficiencyPriority 2 | 9.4762 g 900-FP hydrophobic down at 1,100 g total. | 9.5850-FP down in vertical box baffles. | 8.1470 g of 700-CUIN down at 760 g total weight. | 7.4650-FP 92/8 goose down; weight is 1.72 kg. | 7.8750 g 600+ FP down prioritizes warmth over minimum bulk. |
| Fit And DraftsPriority 3 | 9.2Differential cut, hood, neck collar and full zipper tubes. | 9.1Wider mummy fit, 360° collar and substantial draft tubes. | 7.8Body-hugging mummy shape and adjustable hood. | 8.8Cowl top, scalloped neck and face baffle. | 8.23D contour, adjustable hood and anti-cold flap. |
| Moisture ResiliencePriority 4 | 8.8Hydrophobic down plus DWR 20D shell. | 6.8Down remains moisture-sensitive; use a dry bag. | 7.7DWR shell plus reinforced hood and foot zones. | 6.5Down requires normal dry-bag discipline. | 6.2Down bag; no verified hydrophobic-treatment claim. |
| Weight And PackabilityPriority 5 | 8.91,100 g; 19 x 30 cm packed. | 9.61 lb 9.7 oz unisex weight in independent test. | 8.7760 g listed by Bergzeit. | 6.522 x 38 cm packed; not an ultralight bag. | 6.81,257 g with sack in independent review. |
| Construction DurabilityPriority 6 | 8.720D ripstop and anti-snag YKK zipper. | 6.5Reviewer flags thin material and shorter expected life. | 8.0Toray fabric and two-year warranty. | 8.0Microtex R/S outer. | 8.020D nylon shell is less fragile than 7–10D ultralight fabrics. |
| Usability And RepairPriority 7 | 9.2Pad straps, pocket, limited lifetime warranty and repair service. | 7.0Simple controls; zipper can snag and no stash pocket. | 8.3Two-way full zip and inner pocket. | 8.2Foot-friendly zip and internal pocket. | 8.3Double zips, mat pocket and hood adjustment. |
| Weighted value | 8.5/ 10 | 8.1/ 10 | 7.4/ 10 | 7.0/ 10 | 6.9/ 10 |