Description

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