Heats up immediately. Its super slim and can be wedged between layers. I put a badge clip on the end of it and wore it around my neck to where it was chest or stomach height and it feels so cozy and warm. I made a sleeve for it to be in cause it gets quite warm and feels nice having a soft layer between that and your bare skin. Only last a couple hrs but it came in clutch several times last winter. I can't complain.
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