This product combines luxury comfort and tailored support to provide a great night's sleep every night. This mattress is good for you and good for the environment, as its comfort layer is made from 100% recyclable plastic bottles which offer breathability - due to natural airflow - and enhanced comfort for a more refreshing night's sleep. Silentnight's spring system encases individual pocket springs which respond independently to the weight and offer to zone across the mattress, scientifically proven to provide superior spinal alignment and body support. The mattress is finished with a luxury soft knit cover. It provides medium-firm comfort, meaning it's great for those who switch sleeping positions through the night. Size: Double (4'6)