This is a collaboration hat between OVERRIDE and Sauna Ikitai. The navy color with the "Sa" name is a popular model at Sauna Ikitai. A sauna hat is worn to protect the head and hair from the heat of the sauna. It has a water-repellent, stretchy fabric with lightweight, highly insulating, high-performance batting inside. It has high insulation that rivals that of a typical wool felt sauna hat, and it won't lose its shape even when washed in a washing machine. It also dries quickly after washing, so you can use it cleanly every day. It's designed to be worn as a cold-weather hat from home and can be used in the sauna room as is. I think it's a stylish hat for everyday use, even if you don't go to the sauna. The size is listed as 58cm, but it has stretch and can be worn comfortably by those with a head size exceeding 60cm. Please consider it.