Review on HotHands Hand & Toe Warmers: Long Lasting Safe Natural Odorless Warmers - Bundle of 24 Pairs of Hand Warmers & 8 Pairs of Toe Warmers - Air Activated by Tony Jockheck

I always thought HotHands was a quality brand but foot warmers do not live up to my expectations of this brand. They're obviously very thin to fit in your shoes, but they crystallize, you could say. They become hard and the material sticks together into small balls. It looks like the material used in foot warmers is completely different than hand warmers. Either take the foot warmers out of the shoes and shake them after 1-2 hours and then every hour, or put hand warmers in the shoes like I did.