I was on the lookout for headphones to wear while running. Most in ear headphones fall out, even expensive ones. The KSC21 work great though and don't fall out as they hook over the ears. The sound quality is good, as you'd expect from Koss. They're not the most comfortable for wearing longer than an hour however, as they tend to hurt my ears. I have quite big ears also so they're a bit sticky-outy when I wear them despite looking like they'd sit flush to the side of the ear.
Verified purchase: Yes | Condition: New
I have had a pair of similar Koss75 headphones for a number of years which have been excellent. They needed replacing so I bought these. They are cheap and flimsy and far and away the tinniest sounding headphones I've ever had. Quite unusable. I would have returned but made the mistake of scrapping all the packaging before using them for real.
Verified purchase: Yes | Condition: New
BIG is not always better. Although small in size, it has good, clear sound quality. Not much bass, but it has good treble and mid range. The earpiece is comfortably fit, not too loose nor too tight. The swivel can be rotated to any angle out from the ear -- great for adjusting the sound towards or away from the ears while listening to music. Having used the Koss KSC45 model, this is a much better design and comfortable fit. Four stars, only because it lacks bass sound. A quality product from Koss.
Verified purchase: Yes | Condition: New
Koss is always a great phones, very good sound
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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