The size 11 fit my wider calves (16.5, no jeans) without any stretch in the elastic. For reference I can usually squeeze into regular boots, but its uncomfortable and unattractive, on the other hand many wide calf boots are too wide and shaped oddly- making me look like a kid trying on moms boots. These are a great intermediary for my athletic legs, and I am sure someone with calves larger than mine could wear them because of the elastic panels. Whats also nice is that they actually taper nicely to the ankle- unlike the brands that don't taper at all or don't taper until they get to the ankle and look like a funnel- its a nice, even, and natural taper. Great boot for someone who naturally has a stronger/robust build and has a hard time finding boots that they don't want to look like they're swimming in. Their quality goes with my lifestyle, so its nice to get to be a little more dressed up, but stay active outdoors.