FIT GEAR Waist Trainer and stomach shaper Before ordering: Use tape measure to measure waist, and please remember Waist Trainer must fit very tight in order for it to work; Medium (Waist:24-27) (Hips:35-38), Large (Waist:27-30) (Hips:38-40), X-Large (Waist:30-33) (Hips:40-43), XX-Large (Waist:33-36) (Hips:43-46) High-quality, durable, odorless latex band boosts thermal activity during workout and promotes waist trimming of stomach and waist area Material: Core Area: 100% Natural Latex, Interior Lining: 96% cotton/4% spandex FIT Gear Waist Trainer is perfect for the gym, working out, running or walking. It creates compression in your core to stimulate thermal activity. The gym Waist Trainer is the most comfortable waist shaper offered. FIT Gear Waist Trainer is recommended for first time users and can be worn while sleeping, working out, and throughout your regular the day