The THERMOLITE® Reactor liner is Sea to Summit's top selling and lightest thermal sleeping bag liner. It's an excellent cold weather option for those who need additional warmth. The hollow core fibres trap heat and offer extraordinary insulating properties. This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. Compact and lighter weight than fleece, this is a best seller for good reason.

Features

• Adds up to 8°C / 14°F of warmth to a sleeping bag
• Lighter weight, more packable than fleece
• Mummy shape with a box foot
• Draw cord hood with mini cord lock
• Extends life of sleeping bags by keeping them clean
• Contrasting colour along the top edge makes it easier to find the opening
• Packs into its own Ultra-Sil stuff sack
• Easy care, machine washable