yestyle Waist Trainer Women's Waist Corset - Sport Shapewear High quality fabric breathable and comfortable enough to be worn all day long, sweat-free comfort, antibacterial, moisture wicking. The waffle knit fabric is 90% nylon and 10% spandex, making our trimmers durable. Hand wash for best results. With 4 pcs spiral steel bones will more stiffness and keep you in best posture. When worn during exercise, the compression stimulates thermal activity in your core which increases perspiration, allowing toxins to escape. Ideal gifts for any women that loves caring about their body shape. New Moms, Birthdays, Christmas, Black Friday, Cyber Monday It helps to reduce 4-5 inches in waist when you wear it.you could read size pictures on left to select the right size you need