Does anyone use polyester webbing for anchors? It seems better than nylon for this purpose. Polyester has better UV resistance and doesn't lose as much strength when wet. It does start out with less strength, but it retains it better over time. Yet, no shops I've seen stock polyester and I've never heard of anybody using it for canyons. Or on climbing descents for that matter (which typically see more UV than canyon webbing). What gives? Just inertia? At the very least, it seems worth using poly in high-UV situations, like the opening rappels to some canyons where the webbing sees a lot of sun (I'm thinking the first rap in 150-mile in the GC). Or perhaps Death Valley.