Yamamoto Chemical Industry Bio-Rubber Eye Mask No box Purchased several years ago and used a few times, then stored. I think it's in good condition. Retail price: 21,000 yen ■ The Bio-Rubber eye mask was jointly developed by Yamamoto Chemical Industry Co., Ltd., which boasts a global share in wetsuits, and Dr. Morioka, over a period of about four years. ■ At the Clinical Ophthalmology Society in 2006, Dr. Morioka reported on "The Thermal Effect and Recovery Effect of Eye Strain by the Active Elastic Bubble Body (Bio-Rubber) Eye Mask." The content showed that the surface temperature of the eyes significantly increased after 3 minutes of wearing the eye mask, and a significant therapeutic effect was observed on experimental eye strain. For more details, please refer to my book, "Leave Eye Strain to Me!" ■ The Bio-Rubber material is gentle on the eyes and eyelids, and the band is also made of Bio-Rubber material, so it can be used comfortably. Please use it before going to bed, during breaks, or when traveling.