Sea to Summit Reactor Fleeceweight Sleeping Bag Liner, Regular

Transform any sleeping bag into a year-round sleep system with the Sea to Summit Reactor Fleeceweight Liner, the ultimate companion for cold weather backpacking and ski touring adventures. This technical liner leverages innovative Thermolite hollow-core fiber technology to boost your sleeping bag's warmth rating by up to 8°C (14°F) while adding just 400g to your pack weight. The stretch-knit construction with shaped arm openings eliminates the restrictive feel of traditional liners, letting you move naturally throughout the night whether you're winter camping in the Rockies or ultralight backpacking through summer trails. When warm weather hits, ditch the bulky sleeping bag entirely and use this versatile liner as a standalone summer sleeping bag, proving that one piece of gear can handle multiple seasons and save precious pack space for your next backcountry adventure.

Features

• Thermolite® hollow-core fiber technology with grid fleece construction traps and reflects body heat
• Stretch-knit fabric with shaped arm openings allows unrestricted movement during sleep
• Snap connector system pairs seamlessly with Sea to Summit sleeping bags
• HeiQ Fresh odor control technology keeps liner fresh during extended use
• Dual-purpose design functions as standalone warm-weather sleeping bag
• Machine washable and quick-drying for easy maintenance
• Ergonomic shape with fitted hood optimizes warmth retention
• Sustainably manufactured from post-consumer recycled polyester