North WAve Extreme Tech Sizing

Has anyone have, or have used a pair of these tri shoes? I’m about to order a pair but am a little worried about getting the right size. I wear a size 10 US Running shoe and a size 43.5 DMT cycling shoe. Has anyone that wears a size 10 bought a pair of these shoes that can give me an idea about the fit? One site says a 42.5, another indicated a 43, and yet another said a 42. Help!! there isn’t any local stoe that carries Northwave so I can’t go try on a pair.

Thx