We've got sports bras down to a science. Just take it from this high-support style, designed with a breathable strappy design in back, adjustable straps, moisture-wicking fabric and an all-way stretch construction. Moisture-Wicking Breathable Adjustable 4-Way Stretch Back Closure 89% Polyester/11% Elastane Tags removed. Size estimated. Band is approximately 13” across laying flat.