- Date of birth: Tuesday, 08 August 1989
- Height: 201 cm
- Weight: 83 kg
- Position: Middle-blocker
- Spike reach: 357
- Block reach: 326
- Previous clubs: Metro Warszawa, Legia Warszawa, AZS Politechnika Warszawska
- Nationality: Polish
He began as Metro Warsaw player and he’s one of many talented and successful players who started their careers in that club. In 2007, he was the first team player in Cadet Poland National Team when they won the silver medal in European Championship and fifth place in World Championship.
Kłos joined PGE Skra in 2010, although he signed the contract one year before. The coaching staff thought that it would be much better for him to play regularly in Politechnika Warszawska instead of being a substitute in PGE Skra.
Karol supports Legia Warsaw football team. He has become quite active on his Facebook page which is very popular among not only volleyball fans.