I ordered these to be sent to Australia, as the price was good and reviews (bar sizing) were generally positive. I spent a good chunk of time researching the suggested sizing, from both reviews and from Mad Rock's website. I wear a 9-9.5 in street shoes (EU41) which Mad Rock indicated was equivalent to a 9.5/10 in their sizing. Even so, taking into account reviews, I ordered an 11 (EU42.5/275mm), thinking they'd perhaps be a bit big, but that would be OK.
They're crushingly tight. I can't even hobble around in them. They're an aggressive shoe, yes, but even so, I couldn't possibly keep them on for more than a few minutes at a time. So disappointed in this wildly inconsistent sizing. I've switched out for my husband's Evolv Kronos which is the same size (11/EU42.5/275mm), which fit perfectly. Snug, slightly uncomfortable, but they feel just right for climbing shoes.
I'm bummed by these. I wanted to love them. I would hazard a guess that I would have needed to size up another full size to get these to fit - 2.5 sizes above my street shoe.
This review was written in the old system and had content requirements that are different than reviews written today.