I usually wear the Gel Nimbus but bought these because I stopped wearing triathlon socks. They are definitely lightweight and you can see where they reduce the fat for racing shoes and they will work well for the walking leg of an Olympic triathlon. I added elastic laces which I highly recommend. I rode 6 miles on day one and liked them for a race day shoe. Not recommended for beginners. Only missing 5 stars because you can feel the fabric on the toe on your toenails and I'd like to see the heel loop versus the tongue to improve speed during race transitions. I'm sure I will buy them again.