FDA Registered XXXL Pad with Moist Heat: Wider 33.46" x 17.72" heating pad for full body relief; moist heat therapy option is less dehydrating to the skin, allows heat to absorb better, and relieves pain faster. Registered With the FDA As A Class 2 Medical Device 10 Therapeutic Settings & Fast Heating: Heats up in seconds and features 10 heating modes; set a timer from 10 to 90 minutes and the pad will automatically turn off after the selected time Heavenly Soft Microfiber with Heating Wire: Thick and comfortable hypoallergenic microplush hosts an evenly distributed wire for uniform heating of all covered areas