This support corset features a "W-cross band structure" with two cross bands on the back to provide firm compression! Unlike traditional hook-and-eye closures, the belts tighten from both directions, allowing you to adjust to your preferred position and experience a comfortable level of compression. The wide design gently and stably supports the lower back from all sides. The durable Velcro is also a key feature. With four compression bones, this corset relieves pressure on the lower back and firmly supports the pelvis and waist, making your back feel more comfortable. It can also be used as a pelvic correction belt or a diet belt. The breathable mesh material prevents stuffiness from sweat, keeping you feeling fresh and comfortable♪ It can be used all season long, regardless of the weather. ※This product is designed to reduce the burden on the lower back and is not a medical device. Do not machine wash or tumble dry. Hand wash in lukewarm water and hang to dry. Color: Black. Sizes are unisex, with S size fitting waists from 70cm to 85cm. The vertical width is the same for all sizes: approx. 23cm at the convex part and approx. 21cm at the concave part. Measure your waist over your underwear to determine your size.