Insta Slim body slimming shirts from the I.A.S. Collection flatten your stomach, redefine your chest and eliminate your love handles. Crew neck t-shirt and muscle tank styles in sizes from medium to triple extra large. Insta Slim shirts are made from high-quality nylon Spandex blend fabric that slims your torso then retains its shape wash after wash. Can be worn under all your clothing. Look more fit with exercise, dieting or surgery with Insta Slim shirts from I.A.S. Athletics.