Reactor Midweight Sleeping Bag Liner

Enhance the warmth and performance of your sleep system with the Sea to Summit Reactor Midweight Sleeping Bag Liner. Designed with advanced Thermolite® Pro fabric, this liner uses infrared-absorbing ceramic pigments and hollow-core fibres to efficiently trap and retain body heat. The result is a measurable warmth boost of up to 6°C (11°F) without adding unnecessary bulk to your pack.

The stretch-knit construction ensures a comfortable, close fit while allowing freedom of movement throughout the night. Integrated arm openings provide versatility and ventilation, making it suitable for a wide range of sleeping styles and sleeping bag shapes. Whether you're camping in cooler conditions or simply want to extend the life of your sleeping bag, the Reactor Midweight is a reliable, high-performance addition.

Engineered for practicality, this liner is quick-drying, easy to clean, and treated with HeiQ Fresh odour control technology to keep it fresher for longer. By acting as a protective barrier, it also reduces the need to frequently wash your sleeping bag—helping maintain its insulation performance over time.

FEATURES:

• Boosts Sleep System Warmth – Thermolite® Pro uses Far Infrared technology and hollow-core fibres 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 odour 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 fibres and bluesign APPROVED materials to minimise environmental impact

SPECIFICATIONS:

Best Use: Backpacking, Cycle touring, Paddle touring