Boost your sleep system&&';;s warmth with the Reactor Fleeceweight. ThermoliteA(R) hollow-core fibers and grid fleece trap and reflect body heat, adding up to 8AdegC|14AdegF with minimal weight. The stretch fleece and arm openings allow freedom of movement, while snap attachments fit Sea to Summit sleeping bags for easy access. Easy to clean and quick-drying, it features HeiQ Fresh odor control. Using a liner reduces sleeping bag washes, helping preserve loft and extend lifespan. Best Use: Cold-weather backpacking, Ski touring, (Stand-alone) summer use Features Boosts Sleep System Warmth - Reactor Fleeceweight uses ThermoliteA(R) hollow-core fibers and grid fleece to trap warmth with minimal added weight Freedom to Move - Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep Technical Shape and Hood - Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk Stay Fresh Longer - HeiQ Fresh odor control technology keeps the liner fresh after extended use Sleep System Integration - Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit Easy to Keep Clean - Machine washable construction simplifies care and reduces wear on your sleeping bag over time Lower Impact Materials - Crafted with certified recycled fibers and bluesign APPROVED materials to minimize environmental impact Can be used on its own as a lightweight sleeping bag in warm-weather conditions Tech specs Regular Weight 14.1oz Dimensions 76.0 x 31.5 in Packed Size 5.9 x 9.8 x 5.9 in Material(s) 100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester