This is a size M back support belt made of breathable mesh material for comfortable wear. I only tried it on after purchasing it, so it's almost new. It was stored because the size didn't fit. 【Product Description】 "Unique Massage Cup Design" + "Breathable Material" → Optimal comfort support for postpartum care and back pain → Adjustable tightening without stuffiness, stress-free for long-term wear "Medical-grade Pelvic Support Technology" "Slim Design" → Corrects posture and supports daily activities → No batteries required, a corrective belt that doesn't get in the way during travel or housework "Lightweight material that can be hand-washed" "360° adjustable belt" → Easy to wash and fits your body shape → Covers everything from postpartum recovery to daily back pain prevention with one belt 【Size】M ※ Please refer to the images for details. 【Color】Black 【Included】Instruction manual