it is heat moldable, u can do it a few times, but yeah they pack out alot, like said above, when in doubt i also go a size down. Personally if i were u i would try them both on again, what did u measure to exactly? I measure to a 28, and i went with a 27.5, and they packed out too much for me, toe jam like a mother fucker. If ur foot really is that wide, u might wanna check out a tecnica HVL boot, high volume fit, and they are super wide. I know the toe box in spk's are a 104mm, im not sure about the last tho, maybe its a 102? someone correct me if i am wrong. The agent 90 from tecnica is a 102 last, so its a wide boot also, better line personally, actually has a cork footboard with a shock absorbtion bottom to it. I have the first year spk's, and they dont even have a foot board in them, so shitty. The agent 90 is also a 4 buckle boot, and might fit ur foot better, just see if u can try it on.