Best for: All conditions and distances, swimmers who need a boost
A smooth lining makes the 3.8 feel luxurious, but buoyancy panels along the front and the lower back to the calf are what make it special. It’s like swimming with a float tube molded to your body that aids rotation and decreases fatigue. Flexible arms won’t impede range of motion in the shoulders, but the neck takes some finesse to lock down correctly without leaking water while sighting. We suspect mediocre swimmers will see instant improvement in swim times with this, but seasoned swimmers will like it too for any distance or water temperature. Bonus: A key holder lets you take tiny valuables with you in the water.