There's Velcro on Amazon that comes with a peel and stick back. If they start to come loose, I put a small drop of of gorilla glue on the corners. It keeps them from peeling up if you sweat a lot.

I think this is the last batch I bought: https://www.amazon.com/VELCRO-Brand-Industrial-Strength-Thickness/dp/B003WMJHIO/ref=mp_s_a_1_13?crid=PIFUNQP9UUIE&dchild=1&keywords=velcro+heavy+duty+industrial+strength&qid=1635570665&sprefix=velcro+heavy+&sr=8-13