The Reactor Extreme Liner with a mummy shape and ThermoliteA(R) Pro fabric offers superior warmth, versatility, and increased insulation thanks to its new infrared technology and comfortable stretch fabric. The drawcord helps retain heat for cold conditions while the permanent ceramic pigments in the fabric reflect the body&';s infrared rays back to the wearer. The liner is also eco-friendly, made from 100% recycled ThermoliteA(R) EcoMade fibers that have a lower carbon footprint. Additionally, it is treated with HeiQ Fresh FFL, a highly effective odour control technology that uses a bio-based Amino Sugar Polymer to neutralise body odour. Sea to Summit Liners truly offer the best in quality and sustainability.Features: Warm and Cosy Drawcord allows the footbox to be open or closed allowing more temperature control and comfort. Thermal Boost +7% for a 3 Season Sleeping Bag Thermal Boost +15% for 1 Season Sleeping Bag 50% Thermolite Pro Yarn, 50% Thermolite EcoMade yarn: Fibre made with 100% recycled resources Tested in accordance with ASTM D1518-2014 Max User Height: 177cm Weight: Approx. 342g