My husband and I purchased the hand warmers for my stepfather who was recently diagnosed with lung cancer.  He is always cold, especially his hands, so we thought this was an excellent gift for Christmas. We were right — this was the best gift we could have given him. He just loves them. They are so toasty and they continue to stay that way for a long time. He also uses them on his neck or forearm or wherever he feels a chill. He even puts them in is bed to warm that up before he gets in. Needless to say, they are used continuously throughout the day.
…they are used all the time, even on hot summer days as he still gets cold. For all of the use the mitts get, they have held up wonderfully.