I am going to buy a pair of Dragonfly spikes online, but no store within 6 hours of me has them in stock to try on for sizing. I have never worn Nike trainers before, only some ZoomX Rival Distance spikes which I foolishly bought in a looser fit. I wear a Men's 10.5 in Saucony and Brooks shoes. How much should I size down for sockless/thin sock wear?