TOPTIE Slimming Neoprene Vest Hot Sweat Shirt Body Shapers for Weight Loss Mens Please see our own SIZE CHART in description or picture (not AMAZON's) to pick a suitable size. Kindly suggest you to order 2 sizes larger than what you usually wear, because it is a slimming vest. Full length center or side zip closure. Zipper head is detachable, and easy to reassemble if it comes off the tape. Just feel free to contact us if you have questions on the zipper. Material: 80% Neoprene + 20% Nylon. Provides instant abdominal compression and lumbar support. Keeps your body warm and heat up your core abdominal area making you sweat more while performing your daily activities. Helps in burning tummy fat, reducing your abdomen and waist. Hand wash cold; DO NOT wash in a washing machine.