I personally found that they work slightly better if I open them up and let them air out for 10-15 minutes before putting them on my sock and in my shoe. PLEASE REFER TO THE INSTRUCTIONS NOT TO DO THIS SO I DO NOT RECOMMEND YOU DOING THIS UNDER ANY CIRCUMSTANCES. THIS IS JUST WHAT WORKS FOR ME. They don't heat up very long, so I massage them with my toes every 10-15 minutes while sitting in a tree. This seems to heat them up again, but personally I think I'll try either a battery powered system or one that plugs into a power source as they just don't do what I was hoping for. Arrived quickly, adhesive sticks well.
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