Worked really well with the heat gel. They fit without feeling like there is anything on your foot while holding your foot in place. I am flat footed. Toll! The treble is my least favorite part of the sound. I bought it as a temporary solution while transitioning and it is still holding strong. 5 year old son loves these! They sound even better with Dolby Atmos. I got this sandal for go to the wedding next week in Ca, usually i get size 7,5 for sneaker and 7 wide for sandal, this one i get 7. Another reviewer said it perfectly: return this pair and invest in the real leather ones for $135.