New Arrivals/Restock

Optimized for minimal weight and maximum warmth, the Reactor Lightweight enhances sleep system performance with advanced Thermolite Pro fabric, which uses infrared-absorbing ceramic pigments and hollow-core fibers to trap body heat. Adding up to 4C|7F of warmth with minimal bulk, its ideal for ultralight expeditions. Stretch-knit fabric and articulated arm openings ensure unrestricted mobility. Treated with HeiQ Fresh odor control, its quick-drying, machine washable, and helps prolong your sleeping bags lifespan by reducing wash frequency. Features Lightweight and insulative, Thermolite Pro technology with hollow-core fibers and infrared-absorbing pigments enhances warmth with minimal pack size 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 Fits any sleeping bag - Stretch fabric means the Reactor Liner fits any shape of sleeping bag 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