Weighted eye mask now available as a gadget We've focused on ultimate comfort for a good night's sleep. ■Joint clinical research with Yamagata University■ Proven to improve blood flow and increase relaxation, resulting in significantly longer non-REM sleep compared to other eye masks. 【Point 1: Light Blocking with Weight】 The weighted eye mask provides light blocking due to its weight, contributing to deep and efficient sleep. The light-blocking effect supports the most efficient sleep onset. 【Point 2: Deep Pressure】 The eye area is designed with a light weight. The comfortable weight is designed to fit properly, allowing you to rest comfortably. 【Point 3: Washable Cover】 The included cover can be easily removed, and if it gets dirty, you can wash it in the washing machine. 【Point 4: Adjustable Velcro】 Size can be adjusted with Velcro. You can easily adjust the size to fit your face. I bought this about a year ago and used it about 10 times. There are some loose threads, but nothing too noticeable, so please refrain from purchasing if you are concerned. Also, the instruction manual is missing, so it is not included (the product's usage is described on the box, so you should be able to use it without any problems).