The belt is true to size and comfortable. My teenage son is at the growing up stage almost overnight. What suited him yesterday can outgrow him today. Now I started buying him clothes one size bigger because I thought he would soon be able to fit into all of this. I bought this belt especially for him because he can adjust to his size even as he grows. He likes it more than any traditional straps (with holes) as he can customize the fit here too. While I would recommend this belt to anyone, I think it would work particularly well for teenagers or those with waist variations. Size.