H2O Audio has been producing waterproof housing for MP3 players since 2004 and it shows. Although the company's first device, the Oceanic DV-X, was highly innovative and commendably easy to use, it was expensive and bulky. Of course, it was designed for scuba diving, so that was understandable. H2O Audio continued producing more swimmer-friendly housing for iRiver MP3 players and iPods, but the resulting cases--such as the SV iMini--were lackluster. Most recently, we got our hands on the H2O Audio for Nano ($79.95) and were pleasantly surprised by the improvements.True to the player it houses, the H2O Audio for Nano is reasonably compact, measuring about 5 by 2.3 by 0.8 inches. And unlike its predecessor, this case includes the necessary neoprene armband for keeping the player in place while you swim laps or frolic in the waves. Not included are the slightly uncomfortable waterproof headphones ($39.95 list price; $29 street price), but we have to give H2O Audio credit for the adjustable earpieces and the behind-the-neck, ear-wrap styling. It's probably the best for keeping the 'phones secure while you're active in the water.