Sidi size advice needed today!

[Cari]

As far as I know, men's Sidi sizes (the length) are supposed to be exactly the same as women's. What changes is the fit -- women's are supposed to be narrower at the heel and wider in the toebox. That's the beauty of Euro sizing.

I use 41.5 women's Genius 5's (road) and men's 41.5 Dominator 5's (MTB) and they both fit really well. The fit feels ever so slightly different, but in terms of length, they're the same. I actually prefer the men's D5's to the women's I had before because with the women's shoe, my forefoot sort of leans & slides to the outside of the shoe (laterally). Oh, and I wear both with thick socks (DeFeet Cush 3D's) which keeps my heel from slipping and gives me a snug fit without jamming my toes.

According to Sidi's sizing ruler, you're between a 39.5 and a 40.0. From what you described, I would go with a 39.5 if they have it.

By the way, I've uploaded Sidi's sizing ruler. I think it's pretty accurate.

Hope this helps,

Cari