I wanted to mention one more thing just in case others are thinking of buying them.
They use your circulation in your body to warm up. So, if you just plan to use them while sitting or laying on the couch or sitting at your desk this is not the product for you, as it will not really get warm. You need to be moving around or at least up and down.
I wear them at work even though I have a desk job.... I'm up and down to the file cabinets, etc., all the time, so the up and down keeps mine warm. It is funny... when I go to lunch and walk around in the store all of a sudden it gets a little warmer and I remember that I'm wearing it. But then that heat holds for a while.
I hope that helps someone decide if this would work well for them or not so nobody spends the money and is disappointed in the results.
I have mine on now at my desk.... and tea is steeping...... and it's FRIDAY!!