Muck Men's Boot Mudder Waterproof Work Composite Toe - MUD-000C-BLK 13 D(M) US

I bought a little over a year ago and they started to crack and leak shortly after that.

My good old Muckmaster boots are wearing out: the rubber cracking at the ankles where the boot flexes. So I bought these Mudder Comp Toe Tall boots, supposedly the same size. The size is about a half-size too small, though! Even in thin socks, my big toes get cramped. I like the heel projection that makes removing them easier, and the larger loop makes pulling them on easier, too; but wish Muck Boot Co. could get a reliable size measure established.