I used to get numb-toes too. What often worked for me was to lighten up the load on that foot or click out and wiggle it a bit. However, one day, I had loaded my bike in the hitch rack for a long drive to go check out a nice area for some riding. Once I got there, I realised I had forgotten my socks (I was wearing sandals). I quickly located the nearest bike shop which happened to be an REI. When I strolled over to the section of the store that sold cycling socks, I was confronted with a wall of different brands and colours. I started looking for the brand I already owned, Pearl Izumi. Upon finding them, I picked up a pair and on the packaging was a sizing chart that equated shoe size to the sock size. It suddenly dawned on me that I had been wearing a small when I should have been wearing a medium. I purchased 3 pairs of mediums (it was buy two, get one free) and went riding. Surprise! No more numb-toes at all. And I haven't had a case ever since. Something else to think about...