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Therm-a-Rest Parsec 20 Review
Looking for a versatile, 3-season sleeping bag that balances warmth, comfort, and price? In this Therm-a-Rest Parsec 20 review, we dive into why this feature-rich down bag is a smart pick for backpackers seeking performance and value.
The Therm-a-Rest Parsec 20 is a men’s 20°F-rated mummy sleeping bag filled with 800-fill Nikwax Hydrophobic Down, offering reliable insulation in damp conditions. Weighing 2 lbs 4 oz (regular), it’s not the lightest bag in its class, but its spacious fit and smart features make it a standout for comfort-focused backpackers.
It includes a draft collar, zoned insulation (more on top than bottom), a toe-asis foot warmer pocket, and a water-resistant footbox—ideal for high-mileage days in unpredictable weather. The Parsec is also compatible with Therm-a-Rest’s SynergyLink Connectors, letting you strap it to a sleeping pad for a more secure setup.
Key Specifications
| Weight | 2 lbs 4 oz (regular) |
| Temperature Rating | 20°F (-6°C) |
| Insulation Type | 800-Fill Nikwax Hydrophobic Down |
| Shell Material | 20D Polyester with DWR |
| Zipper | Left Side, Full-Length |
| Shape | Mummy |
| Stuffed Size | 7" x 13" |
Comparisons
Therm-a-Rest Parsec 20 vs Western Mountaineering UltraLite 20
The Western Mountaineering UltraLite 20 is lighter, more compressible, and built with premium materials like 850+ fill down and a 12D shell. It excels in warmth-to-weight ratio but comes at a much higher price. The Therm-a-Rest Parsec 20 is heavier but more budget-friendly and offers modern features like hydrophobic down and a roomier cut. Choose the UltraLite for minimalist ultralight performance, and the Parsec for all-around comfort and wet-weather versatility.
Therm-a-Rest Parsec 20 vs Nemo Disco 15
The Nemo Disco 15 is even roomier than the Parsec and features a spoon shape ideal for side sleepers. It also includes Thermo Gills for ventilation and integrated pillow pockets. However, it’s significantly heavier and bulkier when packed. The Therm-a-Rest Parsec 20 wins in weight, compressibility, and better suitability for fast-paced backpacking trips, while the Disco 15 is best for campers who prioritize space and comfort above all else.
Pros & Cons Summary
| Feature | Therm-a-Rest Parsec 20 | WM UltraLite 20 | Nemo Disco 15 |
|---|---|---|---|
| Weight | ❌ Heavier (2 lb 4 oz) | ✅ Ultralight | ❌ Heaviest (2 lb 11 oz) |
| Warmth | ✅ Good | ✅ Excellent | ✅ Warm but bulky |
| Packability | ✅ Compressible | ✅ Highly compressible | ❌ Bulkier |
| Comfort | ✅ Roomy fit | ✅ Trim but snug | ✅ Very spacious |
| Durability | ✅ Strong build | ✅ Premium materials | ✅ Durable polyester |
| Best For | Comfort-focused hikers | Ultralight backpackers | Side sleepers & comfort seekers |
Looking for the right sleeping bag for your outdoor adventure? Visit our Best Sleeping Bags guide.
Frequently Asked Questions
Is the Parsec 20 warm enough for shoulder season trips?
Yes, it’s well-suited for 3-season use with a tested EN/ISO comfort rating close to 20°F.
Does it include a compression sack?
It comes with a stuff sack and storage sack but not a dedicated compression sack.
Can it be secured to a sleeping pad?
Yes — the Parsec features SynergyLink Connectors to keep it attached to your pad.
Is the down treated for moisture resistance?
Yes — the Nikwax Hydrophobic Down repels water better than untreated down.
What size should I choose?
The regular fits up to 6’0”, and the long fits up to 6’6”. Choose based on height.
Final Thoughts
The Therm-a-Rest Parsec 20 delivers a solid balance of warmth, comfort, and value. It’s not the lightest bag out there, but its hydrophobic down, smart features, and roomy cut make it a practical choice for backpackers who prioritize weather versatility and sleep comfort. If you want a dependable, well-rounded 3-season sleeping bag, the Parsec 20 is a strong contender.
