Combine this sleeping bag liner with our winter sleeping bags for added warmth in extreme cold temps (down to 0F). Or use it on its own as a sheet in very hot weather.

The Sea to Summit Thermolite Reactor liner stands out as the lightest thermal sleeping bag liner, providing warmth for cold weather. Utilizing hollow core fibers, it offers outstanding insulation while remaining supper soft, stretchy, and comfortable. Has a mummy shape, footbox, and drawcord hood, making it Compacted and lighter weight than fleece.

The Sea to Summit Thermolite Reactor Liner Features:

• Adds up to 14F/8C of warmth to your sleeping bag
• Ultralight stuff sack
• Thermolite Polyester fabric
• Technical mummy-shape with drawstring hood
• Lighter weight and more packable compared to a fleece
• WEIGHT: 8.7 oz | 248 g
• LENGTH: 6 ft 10 in | 208 cm
• PACKED SIZE: 5.75 x 4 in | 15 x 11 cm