The Powerbeats2 headphones are graced with ear hooks that CNET says you can customize "to fit around your ear better" so they fit "pretty snugly," and the NY Daily News finds they stay "practically glued into your ear canals through just about any workout." They're also sweat-resistant so you don't have to worry about moisture getting in. The same can't be said for exterior sound, as the Powerbeats2 "won’t seal ambient noise out, but that’s by design," according to the NY Daily News, since "outdoor runners need to know what’s going on around them."
Despite the lack of sound isolation, CNET says the Powerbeats2 still deliver "relatively clean, aggressive sound that's filled out with rich bass that isn't overpowering." But iLounge says "your listening experience is going to depend heavily on which ear tips you use," and the audio "had the best balance when we used the flanged tips, although the performance still wasn’t what we expected from Beats hardware."
Beats products tend to have deep bass and high prices, but the Powerbeats2 only seems to have delivered on that second one, making them less of a desirable buy when there are plenty of cheaper sport headphones available that can also deliver a snug fit and solid sound at a much more attractive price.