The waist circumference of size 40 is 3 feet, which is 100 centimeters.

Waist circumference (WC) refers to the horizontal circumference of the waist through the umbilicus (om). It is a comprehensive indicator that reflects the total fat mass and fat distribution. The measurement method recommended by the World Health Organization is: measured The patient should stand with his feet 25 to 30 cm apart and his weight evenly distributed.

Trademarks are used by producers and operators of goods on the goods they produce, manufacture, process, select or distribute, or by service providers on the services they provide, to distinguish goods or services. Origin: a sign with distinctive characteristics consisting of text, graphics, letters, numbers, three-dimensional signs, sounds, color combinations, or a combination of the above elements, and is a product of modern economy. In the commercial field, trademarks include words, graphics, letters, numbers, three-dimensional logos and color combinations, as well as combinations of the above elements, which can be applied for registration as trademarks. Trademarks approved and registered by the state are "registered trademarks" and are protected by law. Trademarks protect trademark registrants by ensuring that they have the exclusive right to identify goods or services, or to license others to use them for remuneration.