I used to get this when wearing my Gaerne GP1 boots. I could manage 3-4 laps before I could barely move my feet. I ended up switching boots and haven't had the issue as much now.
From what I could tell, my feet were starving for blood and oxygen. The boots were very constricting, being tight over my leathers, combined with a pretty extreme leg angle being 6'3" on a Gixxer 600 with high rearsets, and then the constant flexing your legs are doing. Best I could describe it like when you were in school and would grip your forearm really tight and pump your fist to make your veins bulge out, after a bit you can't even move your hand.
I'm using the Alpinestars S-MX Plus now and they've done me pretty well.
Ah awesome to hear man!
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