The ladies' sun hat is made of polyester (polyester fiber), with a soft and skin-friendly fabric that is breathable and comfortable. It is size-inclusive and the brim can be adjusted (55-57 cm / 21.65-22.44 inches) to ensure it fits most head shapes and is comfortable and snug to wear. This summer ladies' UV-protective sun hat provides extensive shade for your head and face. It is made of sun protection materials and has an UPF 50+ rating to protect you from harmful UV rays. The sun hat is very lightweight and foldable. The brim is equipped with memory steel wires that can be freely rolled into a headband for easy storage.