Details, Size & Fit. Recommended for running, training and yoga. Add a pop of neon colour to your workout wear with The Classic Power Up Cross-Back Top from Running Bare. The dense stretch fabric and elastic bust band lend support, and The cross back straps allow for freedom of movement. ?Our.model.is wearing a size 8 crop top. She usually takes a Standard AU8/small size, is 5'9.5" (177cm) tall and has a 64cm waist. ?- Fitted design Dense stretch fabric; neon green Cross back style Reflective logo on front Supportive elastic bust band Made in Australia.fabric / material: NA.SKU: RU859SA48AGX.