I got a pair of Nikes and the 8.5 fits like an 8.5, to me that is. Sizing down might not go down too well as mine haven't packed out much if anything, so they still feel the same but are more comfortable haha. But to double check go in and try the pair you want, just don't expect an awful lot of packing out.
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My snow surfer setup:
2012 153 Lib Tech Attack Banana
Ride Delta MVMNTs
Nike Kaiju Quickstrikes