Product Function Are you still troubled by the strong office fiber, the changeable travel environment and noise when you want to take a rest? This 3D blackout eyemask will help you sleep well and bring you inner peace. Constant temperature hot compress function of this heated sleep mask can help you relieve eye fatigue, diminish dark circles and eye wrinkles. You don't need to worry about the heat would hurt you as our heated eye mask will conduct real-time temperature detection every 1 second, guarantees a constant temperature hot compress within 30 minutes. Product Maintenanc Hand wash gently with water below 40 degrees. Please do not bleach and do not iron the product.