Sea To Summit Reactor Midweight Sleeping Bag Liner

Enhance your sleep system with the Reactor Midweight, designed to deliver efficient warmth and comfort in a lightweight, packable form. Featuring advanced Thermolite® Pro fabric, it combines hollow-core fibres with infrared-absorbing ceramic pigments to trap and reflect body heat, increasing warmth by up to 6°C without unnecessary bulk. The stretch-knit construction and shaped arm openings allow for natural movement throughout the night, while the ergonomic shape and fitted hood help retain heat where it matters most. Designed for versatility, it fits comfortably inside any sleeping bag and integrates easily into your setup. Practical for extended trips, it’s quick-drying, easy to clean, and features HeiQ Fresh odour control to keep it fresher for longer. By using a liner, you can also reduce the need to wash your sleeping bag, helping maintain its loft and extend its lifespan.

Features:

• Thermolite® Pro fabric with infrared technology for lightweight warmth
• Boosts sleep system temperature by up to 6°C / 11°F
• Stretch-knit fabric and shaped arm openings for unrestricted movement
• Ergonomic design with fitted hood for improved heat retention
• Flexible fit compatible with any sleeping bag shape
• HeiQ Fresh odour control technology for lasting freshness
• Quick-drying and easy to clean
• Helps extend sleeping bag lifespan by reducing wash frequency