What does biofreeze help you with? I’m always interested in new help!
I’m not sure what you mean by a reheatable item, but have you ever considered a rechargeable hand warmer? I know they make little ones you can shake to heat up in pouches, but rechargeable ones you can plug into your phone and use alone. I got one for Christmas and it’s been helpful when I’m out and need something to hold me over until I get home. I’ve stuck it in my jeans pocket or side of my shoe before for hip/ankle pains. They’re pretty cheap!
IYING Rechargeable Hand Warmers 5200mAh Portable Power Bank & LED Flashlight, USB Heater Double-Sided Fast Heating Pocket Electric Handwarmer for Winter Camping Hiking, Gift for Women Men Girls Boys https://www.amazon.com/dp/B08JHMPBHX/ref=cm_sw_r_cp_api_glt_fabc_S76T6CNA5HCP542KCAM2