It's almost impossible to find an alternative to indoor heating when my domicile regularly reaches down into the 40's during winter, but this finally did the trick! Having failed to find sufficient sizing or material thickness in prior onesies for my 6-foot tall form, I buckled down for one more try at twice the price and it was proven once again that you get what you pay for. Even the hood is a double-layered design and the zipper rather than buttons up the front further insulates. The footies were the golden touch though, especially since the length of the garment was plenty long enough to accommodate me. It fits loosely enough to allow even my feet to benefit from the cloud of warmth created within almost immediately after donning it. I sleep in it too, being so soft as it is and a remarkably effective way to transition to a cold bed. There is no need for the electric blanket any more. This is my best buy of the year.