Underbust Bra Booster is designed to give "The Girls" the support and boost they need. Your breasts will look larger and fuller than before. A soft and wide under band to prevent riding up, and wide, padded straps that can be easily adjusted. Lined in a soft Cotton/Spandex blend for superior comfort. This garment is considered Firm compression. The bra is constructed of cotton/spandex/nylon. Hand Wash Cold. Dry Flat. Please follow our size chart carefully, when in doubt, please choose the larger size.