Increases sleeping bag performance by up to 25 °F (14 °C) with super-insulating 110 g/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.
- 110 gsm Thermolite® construction throughout
- Adds up 25 °F (14 °C) 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
- Dimensions: 84 × 36 in. / 90 × 210 cm