These were given to me as a gift, and i was every excited. that is until I found out....how thin the rubber sole is. They heat up very fast. I was not able to jog around my track but a couple of times before they heated up to the point it felt like I was bare footed. I tried them again on a hiking trail, sadly this trail was full of rocks, and I felt everyone that I stepped on. These are not for outdoor activites, if you plan to use them indoors while working out then they will work out great. but not made for outside activities.