The SONU Comfort Insert is an accessory that fills in the Comfort Channel, making the SONU Sleep System more akin to a flat mattress, but still with some give for your shoulders. This versatility can be helpful in many scenarios including couples who sleep differently from one another (e.g. a side sleeper and a back sleeper) and for those who simply prefer less space in the Comfort Channel. The Comfort Insert also functions as a backrest for sitting up in a SONU if you don’t have an adjustable foundation. A single Comfort Insert fills in only one side of the Comfort Channel of Queen and King size SONUs, and the entire Channel of a Twin XL.

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