The Reactor Midweight enhances your sleep system with advanced Thermolite® Pro fabric. Infrared-absorbing ceramic pigments and hollow-core fibers trap body heat, adding up to 6°C|11°F 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.

• Boosts Sleep System Warmth – Thermolite® 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
  
• 100% Post-Consumer Recycled Polyester
  
• Stuff Sack: 100% Polyester
  
• Dimensions: 70.1 x 31.5 in | 178 x 80 cm
  
• Packed Size: 4.5 x 7.5 x 4.5 in | 11.5 x 19 x 11.5 cm
  
• Weight: 11.6 oz | 330g