Sea to Summit Reactor Lightweight Liner

The Sea to Summit Reactor Lightweight Liner is a performance sleeping bag liner engineered to enhance warmth with minimal added weight or bulk. Constructed from stretch-knit Thermolite® Pro fabric, it moves naturally with the body during sleep, while integrated armholes provide unrestricted movement for added comfort inside your bag. Far Infrared (FIR) technology and hollow-core Thermolite® fibres work together to trap and reflect body heat, increasing warmth by up to 4°C / 7°F. Featuring HeiQ Fresh odour control, quick-drying performance, and compatibility with Sea to Summit sleeping bags via snap integration, it also helps prolong sleeping bag lifespan by reducing wash frequency and preserving insulation loft.

Features: 
Freedom to Move: Stretch-knit construction and armholes provide unrestricted comfort for any sleep position.
Lightweight Thermal Boost: Thermolite® Pro with FIR and hollow-core fibres adds up to 4 °C | 7 °F warmth.
Easy to Clean: Quick-drying and machine washable with HeiQ Fresh odour control treatment.
Compatible Design: Fits all sleeping bags and snaps into Sea to Summit bags for secure positioning.
Protects Your Sleeping Bag: Reduces washing frequency to maintain insulation loft and extend bag lifespan.
Ideal for backpacking, travel, hut stays, and warmer-weather adventures.

Technical Specifications: 

- Added Warmth
Up to 6°C
- Best Use
Backpacking, Camping & Winter Camping
- Comes With
Ultra-Sil stuff sack
- Material(s)
Thermolite Pro & Thermolite EcoMade
- Shape
Mummy

- Regular: 
Fits up to height: 185cm
Weight: 255g
- Long: 
Fits up to height: 198cm
Weight: 260g