A baseball cap that is said to have spread in the United States since around 1860. After that, it has become an essential fashion item. It is a convenient item that blocks the sunlight and brings a sporty style. CFCL's baseball cap is made by computer programming knit technology to combine the body and brim without sewing, giving a stiff shape, urban impression. We used the "heat-fused yarn", which is hardened with recycled polyester at high temperatures, to create the breathable baseball cap through post-processing with heat. CFCL baseball cap contains a built-in size adjustment tape to use without the boundary of gender.