The New Smartwool PhD(r) Seamless Racerback Elite Fit Bra (Pink Horizon Heather) Women's Bra, female, Apparel , Top , Bra, XS, true, Designed for medium-impact performance the PhD Seamless Racerback Elite Bra provides the right amount of support to keep your workout moving. Slim Fit is designed to follow the body's natural contours. Sports bra is designed for support during medium-impact activities. PhD fabric: