Lightweight: Compact, 650 Fill Nikwax® Hydrophobic Down packs small while staying dry longer and drying faster than untreated down. Compact: Designed to easily fit into your pack. ThermaCapture Seams: Traps radiant body heat and retains warmth without adding excess bulk or weight. Updated Footbox: Newly shaped footbox can slip over your pad to eliminate drafts or over your feet for extra warmth. Draft Protection: Full-perimeter side baffles.

Extremely lightweight and roomy sleep sack or sleeping bag liner for hotels, youth hostels, alpine huts, boats, planes and trains - with Insect Shield insect protection. 100% Polyester CoolMax is the fastest drying moisture management fabric. Its four-cha

Our most popular sleeping bag liner! The Reactor is made from 80g/m² THERMOLITE®—the lightest weight THERMOLITE® fabric available. THERMOLITE® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable. The Reactor adds up to 8°C of warmth to your sleeping bag or can be used alone as a warm weather bag.
Our most popular sleeping bag liner! The Reactor is made from 80g/m² THERMOLITE®—the lightest weight THERMOLITE® fabric available. THERMOLITE® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable. The Reactor adds up to 8°C of warmth to your sleeping bag or can be used alone as a warm weather bag.

Compatability: Adjustable to fit snugly around tapered and rectangular Therm-a-Rest mattresses. Versatile: Integrated perimeter loops mate the sheet with Therm-a-Rest quilts and blankets to create a comfortable and warm sleep system. Comfortable: Brushed polyester adds luxurious feel and breathability. Cleanliness: Keeps mattress clean; easily removable for laundering.