Bought these in fluorescent yellow as a relatively new running shoe when I was advised to get a reflective upper for road running. It was the cheapest "cool" fluorescent top I could find. Much to my surprise, it has become my favorite running top. The reflective element means I can confidently wear it down any descent of my choosing, even if I do a little off-piste, and it has fantastic breathability and relatively low chafing (okay, nipples hurt a bit when I run at 125 km/h). Week!). I've worn many other brands, some cheaper, some more expensive - few can compare.