Bought these for a two week trip to Costa Rica, and they exceeded my expectations. I wore them most of the time when I was at sea level. They are the fastest-drying clothes I've owned, once completely drying in two hours with the help of a small fan. The zippered back pocket came in very handy when I wanted to get wet but not leave valuables on the beach. The shorts stayed on while I was body surfing in ten foot waves or standing or swimming under a heavy waterfall. They dealt easily with both hot and cold water swimming and class V rapids. They also stood up to rappeling down a 75-foot waterfall, where the harness put stress on the shorts. They looked good enough not to bother the fish when I was snorkeling, though no one mistook me for a surfer dude.
The only drawback: the front pockets turn inside out in strong currents and waves.