Thank you for viewing. This is a relaxing eye mask. It's a single-use, warming eye mask. This is a set of 4. Comfortable temperature: approximately 40 degrees Celsius Heating time: approximately 20 minutes ⚠️Do not use if you have eye or eye area conditions/inflammation (injuries, swelling, eczema, etc.) People sensitive to heat People with diabetes or other conditions that affect heat and blood circulation Children and those unable to stop use immediately if desired⚠️