You could get something like this that they can hold or you can stick under their butt, and it should help a little bit. I live in Chicago, and we have one for our walks/runs to daycare in the morning during the winter.
I have one of these: https://www.amazon.com/gp/product/B08K7BFP8N/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
And love it. It gets very warm and lasts for a long time.
I also have these:
https://www.amazon.com/gp/product/B09C34DBYG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I don't like them as much because they don't get as warm. I do like that they split in two. There are other brands that split in two and have higher power so I might get some of those.
Item | Current | Lowest | Reviews |
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OVALDENT Hand Warmer Rechargeable 7800mAh, Type C… | - | - | 4.6/5.0 |
^Item Info | Bot Info | Trigger