I, like most people, have spent lots of time and money trying to find the perfect earphones for use in the gym and in the majority of cases have ended up disappointed. These seemed like they were ideal due to the enclosed earloop design (having a hook or a loop is the ONLY type of earphone that works comfortably in the gym, believe me), the in ear piece is ideal for comfort, as they don't dig into your ear, and as long as the hook/loop holds them in place the sound quality from Sony is always good with excellent bass.
These started off brilliantly, great sound volume and bass, stayed fixed in place in my ear (only get these if you have above average sized ears), and comfortable. I had finally found the perfect pair...
But, then the big problem. I do tend to sweat in the gym (who doesn't?) and this includes in the ears too... all of a sudden the sound faded completely, to a whisper. Rubbish, I thought I had a faulty pair. But then on the next trip to the gym they were again perfect to start of with, I started sweating again, and hey presto same thing happened, and then for a third time too.
It appears they are NOT sweat or splash resistant and need to dry out before working again. This is a massive disappointment from Sony as I was previously using MDR-J20s from Sony with exactly the same earpiece and they don't have the same problem although they are earhook so can hang off your ear quite frequently.
Sort these out to be sweat/splash resistant and they would be perfect. A shame.