I use quite an unusual one, it is made by source and is very long and thin, I didn't like the thicker ones because they tended to bounce while I ran. I can't remember what model it is but there is a picture of me wearing it on this photo on the right<br><br><img alt="" src="http://www.benlairig.com/images/gallery2/orig/1bb01b3113f871a2ea369be984369c8f.jpg" style="border:0px solid;">