Sea to Summit Reactor Lightweight Liner

Boost your sleeping bag's warmth without the extra heft. The Sea to Summit Reactor Lightweight Liner is your secret weapon for cosier nights. Its stretchy Thermolite® Pro fabric hugs your movements, while clever armholes let you sprawl out freely. The clever bit? Far Infrared (FIR) technology and hollow-core fibres work together to trap and reflect your body heat, cranking up warmth by up to 4°C without the bulk. Snap it into compatible Sea to Summit bags for a snug fit, or slip it into any sleeping bag. Built-in odour control keeps things fresh on long adventures, and it dries quickly too, meaning less laundry and a longer life for your beloved sleeping bag. Lightweight, versatile, and genuinely clever.

Max User Length: 170cm (Short). 185cm (Regular). 198cm (Long).

Best Use For: Backpacking, Camping & Winter Camping.

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.

Specification

• Shape: Mummy
• Added up to 4°C Warmth
• User Length: 170cm (Short). 185cm (Regular). 198cm (Long).
• Weight: 235g (Short). 255g (Regular). 260g (Long).
• Stuff sack included
• Materials: Thermolite Pro & Thermolite EcoMade