The Reactor Midweight enhances your sleep system with advanced ThermoliteA(R) Pro fabric. Infrared-absorbing ceramic pigments and hollow-core fibers trap body heat, adding up to 6AdegC|11AdegF to a sleep system with minimal bulk. Stretch-knit fabric and arm openings allow unrestricted sleep, making it a great fit for any shape sleeping bag. Quick-drying and easy to clean, it features HeiQ Fresh odor control and helps extend your sleeping bag&&';;s lifespan by reducing wash frequency Best Use: Backpacking, Cycle touring, Paddle touring Features Boosts Sleep System Warmth - ThermoliteA(R) Pro uses Far Infrared technology and hollow-core fibers to trap and reflect body heat without extra bulk 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 Tech specs Regular Weight 12.3 oz Dimensions 76.0 x 31.5 in Packed Size 4.5 x 7.5 x 4.5 in Fits Up To Height 6 ft Material(s) 100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester