Berlei Support Factor 2 - Medium Impact. Reduces breast bounce by up to 40%. Your perfect bra for medium impact sports such as weights, walking or cycling. Berlei is the only sports bra brand tested, approved and endorsed by the Australian Institute of Sport. Ventilation zones and use of breathable fabric delivers cool comfort. Comfortable shaped and padded straps convert to crossback to provide additional support, while reinforced cup side panels support and shape the bust.