Heated mattress pads and electric blankets can both be used with your Sleep Number Bed by Select Comfort™. These accessories are a great way to further customize your sleep! Please note that the use of a heated product with the mattress will cause your Sleep Number® firmness setting to vary. These variations are completely normal and it does not mean your mattress is losing or gaining air. Rather, it reflects the varied pressure in the air chamber due to the temperature difference.