Otherwise the shoe would have been perfect. I have a pair of the original Olas that I have worn to the point that there is ZERO tread left on about 90% of the sole. ??The mic is clean and clear when speaking no cracks or muffled voice. In this case it does not do what it says on the tin. I purchased two more for my single Frenzy Malibu kayaks. Id hoped Id be one of the lucky ones. I previously owned the M50x which I really liked but ended giving them to my nephew as a present since he needed new headphones and I needed an excuse to upgrade to the M70x :-)The two major differences between the M50x and M70x I noticed were:1) Weight: The M70x is noticeably lighter than the M50x which got me worried at first since that usually corresponds to being "cheaply made"; however, putting them on I noticed that I liked the M70x better on my head and the sound quality was awesome! Its comfortable, and very good quality. My daughter uses the same product and this irritated her skin. Tried few of similar buds already, so far this seems to be the best.