A men's swim brief is dependant upon the waist and leg hole elastic. These three elastic loops hold the suit firmly in place. The function of the drawstring is to lock the waist band in place especially for swimmers wishing to dive or perform flip-turns or other severe kick offs from the pool sides.
Women's bikini bottoms are intended to be more decorative than functional. They are designed for gentle swimming, sunbathing and posing. If you dive in women's bikini bottoms you are liable to dive through them and find them floating on the surface.
The side ties on some women's string bikini bottoms would normally be sewn across the top of the front and rear sections, there would not normally be any elastic running along the tops of these sections or down the sides. The lack of elastic means that the bikini is not self adjusting and entirely dependant on how tightly the side ties are tied. Once a side tie bikini starts to be pulled away by a dive, a hard turn or a big wave it will slip right off whilst a swim brief will be pulled down a little but recover.
The women's side tie string bikini is by the use of side ties rather than of elastic as it's primary source of support is probably more of a loincloth than a swim brief. if you want one then get one but swim gently.
There is a men's string bikini that uses an elastic waist band, has elastic on the side edges and is styled for a man's anatomy, try one of these.
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