What is a firm round cushion used to press curved areas of a garmet?

A firm round cushion used to press curved areas of a garment is known as a tailor's ham. It is designed to help achieve a smooth, professional finish on areas like sleeves, darts, and curved seams by providing a rounded surface that conforms to the shape of the fabric. Tailor's hams are typically filled with sawdust or similar materials to withstand high heat and pressure from an iron. This tool is essential for achieving well-fitted, tailored looks in garment construction.