Tried these on at t'works tonight, bit narrower in the toebox than the instinct (so too narrow for me) but the stiffness and achilles problem's been sorted, they do feel very lightweight when they felt quite clumpy before (imo). Perhaps instinct lace sort of stiffness. I've got a narrow heel and they felt fine, I've never had a shoe fit great on the heel and it's not held me back up to now!