Disclosure: I received this product at reduced cost in exchange for the my honest review this post contains affiliated links.
When it comes to sleeping bags and pretty much anything outdoorsy I am a novice at best. That being said I can tell you whether or not a product is well crafted from careful inspection and the Ohuhu Mummy Sleeping bag is very well constructed. The lightweight material is extremely warm when you are in the bag itself, for a bag weighing at 1.1 kg total it weighs less than most comforters for your bed but provides a significantly lower temperature comfort scale, while giving the user the feel of being under their own blankets. The light weight material has a smooth texture that allows the user to slide into it, albeit a complicated process for the first adventure in mummy bags. The top half unlike a traditional sleeping bag cups around your head with a drawstring that when tightened ties it around leaving only minimal areas of the user uncovered. If you are in an extreme condition utilizing this bag you could very well tighten it and snuggle down so that you are completely covered. The comfort rating is at 8 C with its expected lower limit at 0 C.
My only complaint is the size, I am a very tall woman at 5'11" and around 200lbs I found it a bit tight for my personal liking. That being said I did in fact fit, and I think it would fit someone up to 6' tall as long as they weren't too much heavier than I am or wider. The leg constriction is something that I think happens in mummy bags,