Description

The REACTOR MIDWEIGHT SHORT is a thermal sack sheet from Sea To Summit, ideal for boosting the warmth of your sleeping bag when camping and bivouacking in cold weather.

Designed to give you maximum freedom of movement, this lining uses a stretch Thermolite Fleece fabric with well-placed armholes, so you can sleep in any position without restriction. It fits easily into most sleeping bags and can attach to Sea To Summit models to simplify entry and exit. Thermolite hollow fibres, embedded in a fleece grid structure, effectively trap and reflect body heat to significantly improve the warmth of the sleeping system, with a boost of up to +6°C without adding significant weight or volume. Easy to care for, it cleans effortlessly, dries quickly and stays fresher for longer thanks to the HeiQ Fresh anti-odour treatment, while protecting your sleeping bag by limiting the frequency of washings.

Combining extra warmth with stretch comfort, this model is ideal for keeping you company when the temperatures drop, night after night.

• Thermolite Fleece stretch fabric
• Thermolite hollow fibres (polar grid structure)
• Anti-odour treatment : HeiQ Fresh
• Quick-drying and easy-care
• Heat input: up to 6°C
• Armholes for freedom of movement
• Fits into most sleeping bags
• Can be attached to Sea To Summit bags (easy entry/exit)
• Max size : 170 cm
• Weight: 330 g

Condition

New

Warranty

2 years

Type

Mixed

Year

2026

Organic

No

UIAA Dry treatment

No

Quickdraw pack

No