I got these for my wife for our honeymoon in Hawaii.  We went horseback riding, snorkeling, kayaking, deep sea fishing, hiking, zip lining.  She basically used them for everything, and they held up amazingly well within all the elements.  We went through streams, coral, rock climbed through lava fields, and even on the slippy surface on the boat it still had great traction.  I got the mens version of these and everyone that we were passing by that were hiking in flip flops were asking where we got them.  I highly suggest these!