Mine were tight with wool socks, but not with actual drysuit booties. I have the Fourth Element booties. Both kinds. It may have been the way the sock was binding in the boot. There are also some thin rubber insoles in the boots. Mine came out, but if yours are still there, you could remove them for a few cm more space.In theory. I did just that and ended up with a boot that is too tight, especially when used with a thick wool sock. I hope they'll stretch a little bit after a few more dives.