ValentinA Mens Slimming Sweat Vest Hot Neoprene Sauna Shirt Body Shapers for Weight Loss Material: 80% Neoprene + 20% Nylon. Provides instant abdominal compression and lumbar support; Blue outside, black inside, it's also reversible. 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. Use the Size Chart provided in photo on the left side to determine your size. Measure your waist in inches and determine the corresponding size in the table. Estimated Time Of Arrival: 6-10 Working Days.