NWT SMOKE FREE FAST SHIPPING BUNDLE TO SAVE H Seamless Design High Stretch & Durable Fabric Medium Support Incredibly soft feel 90% Nylon 10% elastane Sweat wicking fabric Fit - true to size Our Most popular Dynamic Bra have taken things to another level. Featuring a seamless design, and a strappy backless detail, this provides a free feeling as if you're wearing nothing. The perfect stand out design, allowing you to move freely to hit your goals and feel incredible doing it. The ultimate back day vibe.