The phrase "warmth factor" refers to the level of comfort and coziness something provides. It measures how warm and pleasant something feels, whether it's a place, an object, or a feeling. Full definition
If you can simply swap out your rounded boots for a pointier toe, you'll still get the same warmth factor while adding a little somethinsomethin that works to keep things chic. (cominguprosestheblog.com)
Of course, the warmth factor is one of the primary concerns for most consumers, and the Sealy electric blanket gets highest marks for warmth in most of the reviews. (best-mattress-reviews.com)
I like knee sleeves just for the warmth factor. (onnit.com)