The arm holder part is made of stretchy mesh fabric that wraps around your arms flexibly and provides a high hold feeling. Breathable and reduces stuffiness, making it comfortable for all seasons. Thumb loop inside the arm holder prevents arm from slipping and slipping. The strap length adjustment mechanism is located on the front for one-handed operation so you can easily adjust the support by yourself. The shoulder strap is secured with a hook and loop fastener on the front and is removable, making it convenient for putting on and taking off. It combines a comfortable and cool design that you cant get with a universal triangular width. The strap buckle is made of reinforced plastic and is not made of metal.