This product is intended to improve living conditions for women who have experienced temporary hair loss due to causes such as side effects of anticancer treatment. It is used by combining an inner cap with an attached hat with a wig and ordinary headwear. The company's hats with wigs can be attached only to headwear with a beltlike core known as a grip on the inside. Until now, they could not be used with knit caps that do not have grips. To remedy this situation, an inner cap for attaching to hats with wigs, making it possible to wear knit caps too, has bee developed. It