The middle-weight bag in our Phoenix range, our Ember 250 is a lightweight and tough 3 season sleeping bag. The Ember is filled with 250gsm spiral hollowfibre, a lightweight synthetic insulation that weighs only 1.5kg and can be packed into a stuff sack for easy travel. This is contained within a hard-wearing Ripstop shell that protects it from rips and scratches, and it has an extra tough boot liner, so you can sleep with boots on without damaging the bag.