The Koss KSC75 are portable headphones with ear clip, and so are ideal for sport.
Koss KSC75 are the same high class specification headphones as the Koss Sporta Pro headphones, but designed without having to have the headband at all. Instead the KSC75 comes with a unique sportclip that fits securely behind the ears. Basically as far as sound performance goes the KSC75 is very slightly better than the Sporta Pro, although most people will not be able to hear any difference.
The technically minded might like to know that the frequency response is 15-25,000 Hz and the impedance is 60 ohms. The distortion is <0.2%. The ear cushions are open. The less technical might just like to know that the sound is crystal clear. The Koss KSC75 has a titanium-coated high polymer diaphragm for accurate sound reproduction. The voice coils are made from oxygen-free copper for signal clarity. The Koss KSC75 is fitted with neodymium iron boron magnet structures for deep bass performance.