Ultraboost 4.0 DNA "Core Black" sneakers The UltraBoost 4.0 DNA now arrive in black colour, resulting in a clean ad versatile look. Here, a Stretchweb outsole featuring Continental™ rubber and a Boost midsole offers comfort on every step. Imported Composition Sole: Rubber 100% Lining: Fabric 100% Outer: Fabric 100%