I picked up the FW13 Black Leather Slip-On's. I'm a size 11.5 in new balance, sebago, Converse. I also wore size 44 for the CP suede chukkas. I picked up 44 for the slip-ons. They run small, especially in the toe box. They fit perfect, other than the top of the toe box needing some time to break in. I'm not sure how the Spring/Summer run, but my guess is the same. I didn't size down, I stuck with my regular size 11/44, anything smaller would've been crazy.