This cap is specifically designed with an extended pouch portion at the back for tucking away long hair. Ties securely in back SIZING: Head circumference, Small: 21” to 23”, Medium: 22” to 24”, Large: 23” to 25” (caps run large, be sure to measure your head before choosing a size - most people wear a small or medium cap). Minimizes scatter radiation exposure of the head and brain Patented XPF® Technology contains no lead or heavy metals; non-toxic 0.5mm lead equivalent protection around the front/sides of the head Machine washable; can be wiped down for cleanliness Lightweight and flexible with a wicking material inside cap and a mesh top to provide maximum comfort Made in USA by BLOXR Solutions Solid colors: Red, Blue, Purple, Turquoise, Poppy Red, Yellow, Black, Gray, Green, Orange and Hot Pink. (All fabric options.) Visit the BLOXR website.