item can be used for a long term. Effectively correct the problem of an incorrect posture of the back and provide strong back support, Features - Color:Black. - Material:Elastic band, SBR. - Size S/M:45.00X37.00X1.00 cm/ 17.68X14.54X0.39 inch. - Size L/XL:48.00X40.00X1.00 cm/ 18.86X15.72X0.39 inch. - The posture corrector uses lightweight, breathable material, durable for long time use. -The shoulder brace is elastic and fits your shoulder well. It wont cause armpit pain. You can also wear it in summer and wont feel stuffy. -You can wear the posture corrector while at home or office, while going shopping, or at party. -Wearing the posture corrector promotes self-awareness of your posture that over time will help you develop muscle memory to keep your back straight. -It will also help improve your overall spine health and posture.