First things first - I have menswear in a size 11.5 but I've read they run small so I ordered a size 13. I also have another pair in size 12.5. So I have two sets: size 13 and size 12.5. I use big shoes with extra insoles that offer a little more support and cushioning for workouts and long runs - and they are absolutely perfect! Plenty of room to spread your toes, very comfortable and no pain or regret. The lightness also improved my running speed. I use a smaller pair for speed work without the extra sockliner and it offers better ground feel, even less weight and a perfect shoe in every way. Each set of shoes comes with additional insoles that really change the way the shoe performs by adding a little more cushioning and support, but due to the size it's unlikely you'll be able to comfortably wear the same shoe with and without the insole. great shoes designed here!