I'll tell you, Alan, I ordered a pair from Sydnie for the same reason. I weigh in at just under 290, I hike, I'm a martial artist- my calves are huge! I actually just finished measuring for a Flamingo kilt, so I have my tape out- my calves measure at 22 inches of solid muscle, so when I walk and these monsters flex, they stretch hose to just about the limits I think (except for my Lewis Rich's, which are wonderfully comfortable!) So as soon as I get my toppers, I'll make sure to let you know how they work on me.