Black L-size innerwear designed to improve fat-burning efficiency through compression on the upper arms. Slim Feather Authentic product Improves posture! Fat-burning diet! I've used my second one. I think it's effective. I'm going to switch to size M, so I'm selling the L size. - Model Name: Slim Feather - Color: Black - Size: L - How to use: Upper arm compression innerwear - Effect: Improves fat-burning efficiency Thank you for viewing. Shipped anonymously.