well i went to try some grub boots on and the usual thing happened… 5 min of walking round the shop and my feet were freezing… back to the drawing board.
Which is why I suggest getting a pair or two of the Dickies boot socks, put thin-ish wool socks on inside them and they make a big difference.
And five minutes just strolling around in a shop is a useless test; if you’re not wearing the right socks, your feet will be cold to start with, and you’re not moving enough for your feet to actually warm up!
I wear my Muck Boots in the depths of winter, when the ground is frozen or sodden and wet, and I’ll happily do five, six or more miles, just wearing M&S cotton-rich sport socks with my neoprene boot socks over the top, and after ten minutes my feet are toasty, and stay that way.
Using a foam kneeling pad I carry around, I’ve sat on the edge of a small stone bridge in December with my feet in the water for a half hour or so, and my feet didn’t feel cold at all.