Parsec LT 20F/-6C Long Ultralight Down Sleeping Bag

About the ThermaRest Parsec Lt 20F/-6C Long

What is the ThermaRest Parsec LT 20F/-6C Down Sleeping Bag good for?

Crafted for three-season trail hikes and alpine ascents, this ultralight down sleeping bag provides for spring through autumn adventures, unleashing exceptional packability for multi-day treks where pack weight is key. At just 886g (size long), the Parsec LT powers backpackers and alpinists who demand proven warmth without the weight penalties. It is ideal for outdoor enthusiasts looking for technical performance across skill levels, from weekend wanderers to seasoned mountaineers.

How will some of the key features of the ThermaRest Parsec LT 20F/-6C Down Sleeping Bag enhance my experience?

Updated for 2026, the Parsec LT has been boosted to 900-fill hydrophobic down insulation, delivering maximum warmth-to-weight performance whilst maintaining loft in damp conditions for reliable thermal protection. In addition, zoned insulation architecture strategically concentrates down where you need it most, trimming excess weight without sacrificing core warmth. A Toe-Asis foot warmer pocket rapidly heats cold feet through a baffled, ergonomic design that concentrates warmth in the footbox. The sleeping bag also features a YKK anti-snag zipper system that prevents accidental tears whilst ensuring smooth entry and exit during cold-morning packups.

Why choose the ThermaRest Parsec LT 20F/-6C Down Sleeping Bag?

ThermaRest unleashes decades of sleep system engineering expertise, ensuring every design element tackles real-world backcountry conditions with proven results. Additionally, RDS-certified down and 100% recycled nylon construction deliver environmental responsibility without compromising raw performance standards. This product also combines technical innovation with sustainable materials, providing backcountry-proven reliability whilst supporting responsible outdoor ethics.

• 900-fill Hydrophobic Down – High warmth-to-weight ratio and features a PFAS-free, water-resistant treatment that allows the down to stay lofty and warm even in damp conditions
• 100% Recycled nylon – Soft, lightweight, durable, with a sustainable design
• Packable – Saves significant space in your backpack, making it much easier to carry on long treks or multi-day expeditions
• Zoned Insulation – Maximizes warmth and trims weight by concentrating down where you need it most
• YKK Anti-Snag Zipper – Prevents accidental tears and eases entry and exit
• Toe-asis Foot Warmer Pocket – Rapidly heat cold feet with a baffled, ergonomic and insulated pocket in the footbox that helps concentrate warmth
• Internal Stash Pocket for Small Items – Keeps small essentials like your phone, headlamp, or medication close at hand
• Cinchable Hood to Retain Warmth – Allows you to pull the hood tight around your face, minimizing the open surface area
• Quilt and Blanket Loops – Customize your sleep system by layering quilts or tech blankets for increased warmth
• Draft Tubes – along zipper and neck to retain warmth
• Included – Compression and storage sack

The Lowdown

• Style: Tapered Shape
• Materials: 100% recycled nylon
• Capacity: Single
• Suitable For: 3 seasons – spring, summer, autumn
• Temperature Comfort Range: 0°C / 32°F
• Temperature Lower Limit: -6°C / 20°F
• Temperature Extreme (Risk Range): -24°C / -12°F
• Special Features: Footbox
• Eco-Credentials: RDS Certified Down

Parsec Lt 20F/-6C Long Size Chart