This Shock Absorber sports bra has been created especially for running, with an enhanced support system to target excessive breast movement and featuring seam-free and concealed elastic to reduce rubbing and chafing. This Shock Absorber running bra has been proven to reduce breast bounce by up to 78%. Top Tip.....Fasten the top clip before you put the Run bra on and then pull it on over your head. The bottom hook and eye can then be fastened once the Run bra is in place. Shock Absorber has a small fit and it is recommended that customers go up a back size.