1. By integrating a dense cotton lining with the outer fabric, the front panel of the chest binder effectively produces a substantial flattening effect. 2. Breathable and sweat-wicking high-stretch nylon fabric. 3. The optimized and enlarged armhole design of the chest binder prevents excessive squeezing of the underarm area. 4. Optimized and enlarged neckline. 5.Engineered with innovative reinforcement, this binder offers unmatched side-tear resistance and extended wear life. 6. Support for high-impact activities like soccer, running, skating, tennis, etc. 7. For enhanced quick drying and comfort, we suggest considering a chest binder from our dedicated SWIM collection, designed specifically for aquatic activities. Fabric Outer: 75% Nylon, 25% Lycra Lining: 100% Cotton 504