ADJUSTABLE SIZE--Adjustment from 28 to 48 Inch in chest circumference. Back Posture Corrector with breathable and latex-free adjustment strap. OVERALL CORRECTION--Shoulder Support Brace Pull back your Upper Back to the right position. And then improve your whole body posture during work or life. USE ANYTIME-You can use it not only when you are sitting on computer or driving a car, but also when you are playing sports or gardening. What is more, you can use it at home when you are doing housework, or watching TV. PRACTICAL--Posture brace filed with Lightweight neoprene, can be worn comfortably under or over clothing.Correct your posture all day.You can put on and adjust by yourself. USE DAILY--This lightweight back support should be worn daily. First couple of days wear it for 10-20 minutes only, than add 10 minutes every day. Your back and shoulders will slowly adjust and you will build muscle memory for the right posture.