When they work the earbuds are solid, and maybe theyd work well for someone that isnt sweating very much when they work out. I ended up kicking the shoes off and my feet felt infinitely better. I was so impressed with the two pair I had bought, I bought another pair just a little bit smaller, for my third hole. These are really comfortable sandals. Im ordering better double stick tape. I found the medium ear pieces just slightly too small for me, so the earbuds wouldnt stay in place. Cobians won?t change the world, but they can drastically alter your lifestyle and attitude. Les plus:- La qualité sonore est excellente, aucun soucis là dessus. They are wonderfully comfortable and the bio mechanical design helps resolve my foot and back issues. These fit perfectly, they feel snug and cozy but not too tight.