Chelsea FC Cap Official team merchandise / licensed product. Ideal for match days, training, travel or everyday wear. Perfect gift for sports fans. This Chelsea FC Camo Baseball Cap is an adjustable, "One Size Fits Most" (OSFM) adult hat. While it comes as a single default size, it features a built-in hook-and-loop adjustable strap at the back. According to the manufacturer specifications for this specific model, the built-in adjuster fits a head circumference range of 55 cm to 61 cm.