The Koala Clip does just what it claims to do - keeps my phone secure and dry while I'm out on a run. I don't wear a racer back sports bra but the Koala Clip works just as well nestled in the front of my bra with the clip attached to the collar of my shirt. The magnetic clip is very strong and keeps my phone from shifting or bouncing as I run, and the pouch protects my phone from sweat and rain. Plenty of room in the pouch for my ID as well! Great product!