1. Made of super soft crystal velvet material on both sides, the heating pad is soft and skin-friendly, breathable, comfortable to touch, and will not cause skin allergies. Provides sufficient comfort and retains heat. 2. Added 2 straps, our waist heating pad is more flattering than conventional models without straps, and is not easy to fall off, fits the curve of the lumbar spine, and reduces lumbar force. 3. Safe and Stable: This heating pad adopts PTC+NTC working principle and ensures safety and stability in use. If the local temperature exceeds 60℃ (140℉), the cushion will automatically cut off. NOTE: Unplug the cable connection with the cushion, then you can start machine washing below 30℃ (86℉) 4.9 Heating Levels for Temperature Control: Rapid heating, constant temperature heat compression, brings warmth to your body, effectively disperses the cold, and protects your health. The temperature ranges from 39℃ to 55℃ (102.2℉ to 131℉) 5. Auto-off Timer Function: The timer button has 4 settings, which are 0.5h/1h/1.5h/2h, saving energy and preventing burns caused by overheating.