Flatten the Chest: Flatten your chest and be boyish cool to help you appear masculine Good Elasticity: Strong wide elastic band attached, and it has nice amount of stretch. Premium Material: The underwear is made of premium fabric, which is soft, light and durable Multifunctional Vest: Convenient, do not fade, no defrmation, fashion style, it is a multifunctional vest Practical Function: Leaving more space for the body and less pressure on the chest; Becoming flat naturally; Not restricting the breath