Review on Upgrade Your Crutch With Ergocap® High Performance Rubber Tip For Greater Stability And Joint Articulation by Renee Hackbarth

These are awesome! I got them to put on my crutches as a more convenient option than the metal flip-down ones for ice/snow. They've provided excellent traction on ice, snow, in the rain, on wet floors, and still work on things like carpet and hardwood without any fiddling with switching something around or damaging the surfaces. They fit snugly but without much difficulty to install (protip: start putting it on partway by hand, then push it the rest of the way down by putting pressure on the cane/crutch with the cap on the ground for more mechanical advantage than trying to push it on all the way by hand). The /only/ issue I've had is it tends to snag/drag a little more than a "standard" cap when going across surfaces like very plush carpets or grass, but that's to be expected.