Measure size 8 on Brannock.
7.5 in chucks, 8.5 in Vans, 7.5 in Alden Barrie
I actually found a few fits with them on ssense, and that convinced me to go with winter version.
Breaking in my Achilles gummy lows for the first time today, unfortunately its breaking me.
They do fit tighter than normal Achilles and feel less flexible. I got two massive blisters on my heels and couldn't walk. But at work so unable to change shoes, had to stick loads of tissue into the back of the heel to stop the rubbing.