Posture Corrector Back Brace Adjustable Posture Brace for Upper Back Shoulder(L) The product is shipped based on the color or size of the main image of the product page. Size:L Adjust the posture corrector to maximum size Wear like a backpack with the Y alphabet facing up Adjust the straps position & Pull the strap tight Make sure it is comfortable & enjoy You may experience some discomfort or tension in the first time using. We suggest you start from 20-30 minutes in the first wearing then extend the wearing time until you are completely comfortable wearing your posture support. Size Chart: XS: Suit for weight: 25-40KG S: Suit for weight: 40-60KG M:Suit for weight: 60-80KG L:Suit for weight: 80-90KG XL:Suit for weight: 90- KG Package included: 1 x Back Corrector