nylon, spandex STREACHY: Use best material with great stretch, much soft and comfortable to wear. No matter give you a great waist shape but loss your weight easily. BACK SUPPORT: Signature compression and flexible boning hold your back and abdomen tight, giving you the back support, reducing waist line and preventing garment roll-up. This great product really helps you with back pain and proper posture. SPECIAL DESIGN: Under-bust design give a free space so that you could do exercise breath freely. BENIFIT: intelligent fabric technology create the Core compresses your figure front to back comfortably and firmly, helping to flatten your midsection and give you a straighter, more confident posture while wearing this waist trainer.Products from BAZHOU's store