TAJwrote a review of Castelli Narcisista 2 Shoe Covers on March 4, 2018
Familiarity: I returned this product before using it
I couldn't zip them up due, I believe, to the zipper being designed to go too low on the back of the shoe and perhaps due to my own inflexibility. The fit on my Sidi shoe was snug but ok. I just couldn't get them zipped even with a lot of effort. So I'm having to return the item. FWIW, I wear 9.5 (US) shoe and bought large.