Look at Outdoor Research, Kuiu, First Lite, and Kenetrek gaiters. All designed for mountain terrain and hunting. If you're wearing out bottom straps in a couple of hours, your gaiters are either using crappy materials/design or you are hiking in broken glass.
Start out in the morning on nice grassy trail, work your way up higher to the tree line and you are on broken shale, limestone and volcanic stones, then into scree slopes and you had better have good gear. The straps just don't last. And when my foot goes down to the ankle or more in scree the buckle takes major abuse, not to mention the boots which I have to have customized to withstand mountain hunting.
