Make your sleeping bag extra warm and toasty on cold nights at the campground. The Sea to Summit Thermolite Reactor Extreme increases sleeping bag performance by up to 25 F (14 C) with super-insulating 110g/m Thermolite fabric. Thermolite is a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Spacious design allows for a comfortable night's sleep, even when the mercury plummets. Perfect for extending the season of your sleeping bag.

Features:

• 110g/m2 Thermolite construction throughout
• Adds up 25° F to warmth to a sleeping bag
• Mummy shape with a box foot
• Draw cord hood with mini cord lock
• Packs into its own Ultra-Sil stuff sack

Specs:

• Length: 84"
• Width: 36"
• Weight: 14 oz
• Temp Rating: Up to 25 F