Im absolutely enjoy these. I know these run small, last year did a 3x and was swimming in it. Ive had it some time now & it continues to work well. Im deeply disappointed. I have this installed in my Cervéjo P3 and I have done around 12 Triathlons + training. I was even so impressed with them that I got a second pair the following week and two more pairs for my Mama and sis. Starting at 30% battery remaining they will either loudly beep or shout "Low Battery" in your ears every minute. It was the easiest thing to put together. great gripping power due to their softer rubber material. his foot is even on the wider side and still drowns in the whites.