I can't answer for runs. But I can tell you that I have had these on for a several hours at a time tilling my property, getting jerked all over the place by the tiller when it hits roots. I have also cleared brush with these while jumping in and out of the bed of my truck loading branches. And I have worn them on my utility tractor clearing high grass and small trees. All of these activities ended with very sore muscles, lots of sweat, joints that have ached from the jolting. Not a single time did these come out of my ears.