517eb1a1_Toppers___BedBathandBeyond_com__What_it_s_for
[Mattress Topper Type] Heated Mattress Pads [What it's for] 
These mattress pads are electric and come with warming controls. Some come with dual controls that let you have different warmth settings for each side of the bed.
Buying Guide to Mattress Pads & Toppers - BedBathandBeyond.com
What it's for