Comfort (EN 13537:2012): -10 °C Limit (EN 13537:2012): -18 °C Extreme (EN 13537:2012): -40 °C Extreme temperatures. Extreme nights. Extremely good sleep with the Protect Fiber Bag -18C. Optimized fit for more restorative sleep. A central zipper provides temperature regulation for climate-controlled sleep. A special material to prevent noise for undisturbed sleep. Extremely good sleep, as if in your own bed, with the Protect Fiber Bag -18C, made from a waterproof material for extreme temperatures. Warm collar: Yes Intuitive climate regulation with a central 2-way zipper Comfortable, soft material in the hood reduces noise and increases comfort Including deep sleep mask and earplugs to reduce light and noises PFC-free DWR treatment Lining made from 100% recycled polyester Easy-to-use magnetic closure on the insulation collar Improved YKK zipper prevents jamming of material Insulated covering along the zipper to protect from cold bridges and enhance climate comfort Insulation chamber arou