I don't know why people giving this product more review. But, this product cannot be used in even 15 degree celcius temp. and they are saying I can be used upto 5 degree. Not suitable for winter. This item is probably for those rich people who has heater in their room. Take this for night trekking in winter and you will probably die with cold. Wasted my ₹900. You can get good warm product from locals Rajasthani sellers. I know those are heavy but they does twice the good job than this one.