Inner cap with adjustable fit and hold that can be adjusted (head circumference) (capacity). Horizontal adjustment: Tightening adjustment via Velcro (Velcro) / Vertical adjustment: You can change the amount of fold on the side and it conforms to curved surfaces when you wear it, and the back rise is different from what you see here. There is no extra cloth for the head and no stiffness. Side-tuck design provides a secure hold under the ear. In addition to the back of the product, it has been reinforced with a core for a comfortable fit and durability. Double stitched for extra tightness and a great fit! If you do not match the size of the users head size, it will not hold it firmly. Many products do not fit the actual head size, so it is not possible to slide inside the helmet. This is an original Kraft-modified inner cap with a size adjustment type that does not exist from other companies. Please use it once. This product is mainly used as a "helmet innerwear," and it also adapts to the tastes of users.