The invention provides a belt which can be used for fastening clothes/goods (such as a swimming waterproof mirror) on a wearer/ a user. The belt comprises a first part which comprises a tensioner. The belt further comprises a portion including marks which are provided along at least part of a length of the portion. In use, the portion including marks traverses the tensioner and the framework of the tensioner defines a window in which at least one of the marks can be seen.