I used it once, but I'm selling it because the smell bothered me and the three-dimensional design made it difficult to turn over in my sleep, so it wasn't suitable for me. I think the smell will be fine if you wash it. It's a popular product on Amazon, so I think most people can use it without any problems. #CLAXIA #Eye Mask SLEEPMASK Black Product Size: 23 x 9 x 2 cm; 70 g Manufacturer: CLAXIA JAN: 4595056559016 ASIN: B0D9XR2M55 Product Model Number: CLA-001 Country of Origin: China 【Quality Inspection by Japanese Inspection Institution】Passed strict inspections by a domestic inspection institution and cleared all standard values. Safety has been confirmed with free formaldehyde testing according to JIS L1041, with results below 20mg/kg. 【Carefully Selected Materials】Made with highly elastic double Lycra fabric and low-rebound memory foam to fit the face and provide ultimate relaxation. 【Excellent Light Blocking】Demonstrated a light-blocking rate of 99.99% in tests based on JIS L1055. Provides a comfortable darkness day or night by almost completely blocking out external light. 【Comfortable Three-Dimensional Design】The three-dimensional design does not touch the eyelids, and the ear-friendly metal strap reduces pain and pressure even during long hours of use. 【Perfect for Gifts】Comes with a storage bag and instruction manual in an elegant package. Recommended as a gift for family and friends. 【Washable and Reusable】Passed the washing fastness test of JIS L0844 and maintains quality even after washing. You can use it with peace of mind for a long time.