这是这个床垫的介绍,an extra firm (the firmest model we've ever carried!)
The Corvina by International Bedding (IBC) is an extra firm (the firmest model we've ever carried!) double-sided (flippable) model. It has a durable and supportive LFK Coil innerspring unit with edge supports and a TENCEL fabric cover.
Its moisture-wicking and breathable cover provide you with a cooler night's sleep. The dense and extra firm foam layers on top of the spring provide you with the flattest, hardest sleeping surface available.