This is a belt for a waist pouch that attaches to an adult's mobile pocket. It's convenient because it doesn't strain your shoulders and can be worn loosely around your waist, so it won't get in the way. The length can be adjusted from approximately 50cm to 75cm. I handmade mobile pockets. If you attach a shoulder strap, it becomes a smartphone pochette, but you can also attach this belt for a waist pouch and use it as a waist pouch. The last photo is an example of use. When combined with a mobile pocket, it fits up to approximately an 85cm waist circumference. This is sold separately. If you purchase it as a set with a mobile pocket, you will receive a 50 yen discount.