Reactor Fleeceweight Liner

The warmest liner Sea to Summit makes, and the one worth carrying if you are pushing a three-season bag into shoulder season. Up to 14°F of added warmth from a grid fleece knit over Thermolite hollow-core fibers, at around 14 oz.

Warm enough that in summer it works as the whole sleep system on its own, which makes it a genuinely versatile piece rather than just an accessory. Technical mummy cut with a fitted hood, stretch knit and shaped arm openings so you are not fighting it, HeiQ Fresh odor control, and shoulder snaps to pair with a Sea to Summit bag.

Specs

• Adds up to 8°C / 14°F to your sleep system
• Short: 365 g / 12.9 oz · 70 x 31 in · fits to 5'7"
• Regular: 400 g / 14.1 oz · 76 x 31 in · fits to 6'1"
• Long: 430 g / 15.2 oz · 81 x 31 in · fits to 6'6"
• Packed size: 10 x 6 x 6 in, all sizes
• 100% post-consumer recycled polyester, bluesign approved
• HeiQ Fresh odor control
• Usable on its own as a warm-weather bag