Picked up a pair of the Sneakerboy x Adidas Pureboosts and at size 13 US, I feel like they fit a half to full size small. I have a few Y3s at 12.5 US (UK 12, the highest size the offer, and have since been retired since the fit isnt great) the fit is almost identical with the Pureboosts...
only 14 left
got to the guitar music, then straight to voicemail all day...
then when I finally get thru this all that's left
pretty lame they allowed online reorders