Comfort-Mate, Bed Warming Mattress Topper by KD Navien(EQHS25, Queen Size) Cotton Warm water heated from a small boiler circulated inside the mattress pad without electronic wave Dual heating, timer, sleep, sterilization and child lock mode with voice guidance (with slim remote) Detachable cover made of 100% organic cotton and inside of mat hoses are made with safe silicone Multi-system ensuring your safety including overflow prevention, overheat and water level sensor etc. Convenient storage bags for boiler and mat with 2 years of warranty