i wear 10.5 in dunks but i skated 3 pairs of the reynolds in 10's. i could probably fit into a size 10 dunk just fine tho so id imagine if your foot fits really snug in 10.5 dunks you MIGHT be able to work with some 11's. i feel like they're more or less the same fit, i just always wore my dunks in 10.5's cuz for like 2-3 years i always thought that was my "true" shoe size even tho now i know its more like 10 & 9.5, lol.