Rab Sleep Limit: -23°C (-10°F) Offering refuge to those exploring the worlds highest peaks and the polar regions, the Andes Infinium is packed with cutting edge tech, built to keep you warm. The Andes Infinium 800 is filled with 800g of ultra-high lofting 800FP, goose down. It is constructed using trapezoid shaped boxwall baffles, which stack together reducing cold spots and maximise the lofting and efficiency of the down inside. Reflecting heat towards the body, the Rab TILT technology is seen as a silver sheen on this inside of the bag. Reducing heat loss by up to 32%, TILT substantially improves thermal insulation without compromising pack size, breathability, or weight. It has a mummy fit and offers a similar level of warmth to Rab's Expedition range of sleeping bags, but in a lower bulk package. The womens specific cut is fractionally shorter than the regular bag with a narrower shoulder and marginally wider hip space, for comfort and efficiency. The Gore-Tex InfiniumWindstopp