Therm-a-Rest

Parsec 0F/-18C

Name: Parsec 0F/-18C
Brand: Therm-a-Rest

top pickEU unverified

EN 13537 comfort of -10°C at 1.10 kg: 762g of 900-fill hydrophobic down, zoned baffles, toe-warmer pocket and full draft tubes. Premium price matches measurable engineering, not brand markup.

$570 typical

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EDITION 01RESEARCHED 2026-08-142 SOURCESREFRESH DUE 2027-02

SUBSTANCE SCORES

substance9.2/ 10

design9.0/ 10

value8.5/ 10

WHY THE PRICE IS JUSTIFIED

The cost buys 762 g of 900-FP hydrophobic down, a -10°C EN comfort result at 1.10 kg, 20D recycled ripstop, a full anti-draft system, SynergyLink pad straps and a repairable lifetime-warranty product. It is technically premium, but its construction explains it.

MATERIALS

Insulation900-FP PFAS-free hydrophobic RDS duck down

Very high loft and improved resistance to condensation-driven loss of loft.

Shell20D recycled nylon ripstop with DWR

A sensible durability upgrade over 7–10D ultralight shells.

BafflesZoned down-baffle layout

Concentrates insulation where heat loss is greatest.

CRITERIA

10/10

Thermal Truth

EN comfort -10°C; limit -18°C.

9/10

Insulation Efficiency

762 g 900-FP hydrophobic down at 1,100 g total.

9/10

Fit And Drafts

Differential cut, hood, neck collar and full zipper tubes.

9/10

Moisture Resilience

Hydrophobic down plus DWR 20D shell.

9/10

Weight And Packability

1,100 g; 19 x 30 cm packed.

9/10

Construction Durability

20D ripstop and anti-snag YKK zipper.

9/10

Usability And Repair

Pad straps, pocket, limited lifetime warranty and repair service.

IDEAL FOR

·sub-zero backpacking
·snowshoe or ski tours
·cold sleepers with an appropriate high-R pad

NOT FOR

·summer camping
·buyers unwilling to protect down from full saturation

DESIGN & ERGONOMICS

Toe-asis foot pocket, anti-snag YKK zip, cinch hood, neck and zipper draft tubes, stash pocket and optional pad connectors form a coherent sleep-system design rather than feature clutter.

LONGEVITY

Cascade Designs states a limited lifetime defect warranty and offers non-warranty repair. Store loose, dry fully after condensation-heavy trips and renew DWR as needed.