I'm in the process of training for M2O. Pretty much everyone I know is having same issue (with and without footstraps), numb feet after 60-80 minutes downwind. I lift my toes, wiggle my feet, but nothing really makes a big difference.

Next run, I'm planning to start moving my feet more even before they get numb to see if that helps.

Besides stopping to rest, anyone figure this out?

Did a lot of longer distance racing on 14ft Sups and after 90min, yeah its gonna hurt.What helps a bit might be wearing compression running socks, thicker pad and wearing surfboots to add a bit more comfort.

DWF said..
Better deck pads

+1You should get deck pads as flat as possible.
The big "diamonds" act as compression points into your feet soles, cutting the blood circulation.

I would sand them off.

For instance this is a pad for wave/freestyle wing boards, where your feet move constantly:



And this is a pad for cruising (in the same brand), where your feet will stay at the same place. Flat.

I haven't read the entire thread, but I often do 2-4 hours riding with no resting. I recently discovered that having enough deck padding makes a huge difference. I normally ride Appletree boards with nice padding, or Armstrong boards (padding's even better). Recently I did 4 hours on a board with a Foiltec pad. Yeah, those are great and very grippy, for shorter sessions. But I found my feet going numb on it after a few hours.