Berlei Running White Underwired Sports Bra B4915 80% Polyamide 20% Elastane Endorsed by Serena Williams, ranked No. 1 in women's singles tennis - Supportive white multiway sports bra with underwired cups, designed to break the impact of physical exercise. Molded cups and lightly padded straps diminish physical impact. Soft lining inside cups to help reduce sweat build up. Clever channelling in underwire wicks away sweat.