T Bruce B.wrote a review of Giro Ultralight Aero Shoe Covers on August 7, 2017
Familiarity: I've used it several times
Despite other folk's experience, I did not have any trouble putting these on, and I like the "no zipper" design. You just have to plan the process out, and basically roll it on from the toe to the heel, getting each section (toe, cleat, up to the heel, etc) tight before moving on to getting it over the heel which is the hardest, but easily done. My only complaint is I wish it did a little better job of smoothing out the lumps and bumps of a shoe, making it more aero. That's what I bought it for, and it does an OK, but not great, job of it. Great value though.