My grandson loves these crocs. Music sounds amazing. It installed easily onto my Giro Feature helmet, stays in place, and holds my Lumina 750 exactly as it should. I would recommend for anyone, just note that if you find discomfort with rubber ear plugs than this may not be the best fit (perhaps larger headphones), but if you are looking for something lightweight and convenient without spending the extra cash on Apple pods, than perhaps this is the best option. However, the putty is non-staining and can be removed completely without any issues. Dont waste your money on these. These are great flip flops, quality feels very nice and durable like I wanted something that works last, only reason I gave it 4 stars instead of 5 is they do run a little small, Im normally a size 11 and my foot goes over the back a little bit, other than that theyre amazing! Make sure to ORDER a HALF SIZE DOWN. It came with no instructions, i had to look on youtube on how to install , but the pads turned out alright. Each leg has 6 holes?2 pairs of screw holes and a pair of bolt holes.