Bitcoin is the right idea Beanie

An all-time classic: the beanie is a stylish accessory that lends a relaxed touch to any outfit. A universal companion for men or women and any season, this is one hat that can be worn inside or outside. Note: the beanie is slightly longer at the back of the head. 

• Fabric Weight: 5 oz (midweight)
• Material: 63% polyester/32% cotton/5% spandex
• Imported product, printed & processed in the USA