STRUT-THIS Ruby Sports Bra in Black. - size XS (also in S,L) STRUT-THIS Ruby Sports Bra in Black. - size XS (also in S,L) 76% nylon 24% spandex. Elastic hem. Made in USA. STRR-WI21. RUBY. Started by two mother and daughter teams in 2011, Strut-This is a brand whose mission is to empower women of all ages to feel confident and be stylish while working out. Their quality active wear transitions effortlessly from the gym to brunch and everywhere in between.