Upon trying this shoe on it fit perfectly. It wasn't until my first ride that I realized how incredibly prominent the arch was. I've been wearing shoes for 30 years but I've never felt pain like that in my feet. I had to dismount, take off the shoes and walk back to my car barefoot. Went to REI the next day and bought a pair of Shimanos in the exact same size. I've been loving those shoes for the last several weeks. The merchant would not take back the Giros. Having been a Prime member for 2 years, this is the only purchase I regret.