It is considerably smaller and lighter than the winter bag and is made from a 190T, water-resistant, windproof, highly breathable fabric. The four hollow chambers provide great insulation and the shape is designed to create less wasted space, allowing it to heat up rapidly.
The breathable material caters for much hotter temperatures, yet is still substantial enough to allow overnighters without the use of a bivvy. Despite it only being ‘water resistant’, I’ve woken up with a large amount of dew on top of the bag without any damp coming through.
Like the Morpheus Ultra 7, this bag features the fantastic 3D hood with baffles, which help lock the heat in. As well as the insulated zip baffles, easy-to-use crash zips and an internal pocket, the bag is also housed in a fleece-lined stuff sack, which can be used as a pillow if necessary. The Morpheus Extreme 4 should certainly be a contender if you’re in the market for a new sleeping bag.