A hat section is composed of two outward flanges (the brim), plus two vertical dimensions (the sides of the hat). Roller Die understands that strength is especially important with regards to hat sections, as they are often produced to support heavy loads and resist bending.
Using Hat provides extra strength to the Solar Panel mounted on it. It is used as a Purlin in Module Mounting Structure. It is used as a supporting column for erecting Module Mounting Structure.