Not the best pictures, but should be enough to see the shapes. F-P2-R F P2 RThe F is the narrowest fitting, as the pictures should show clearly. The P2 and the R feel very similar to me. Visually, the R looks like it has more room on the instep side of the toe box, but I don't notice a difference because I have plenty of room in the P2. The biggest difference I feel between the P2 and the R is my R is very slightly larger in the heel cup.