A sporty bikini with adjustable features means tie closures or sliding adjusters that let you customize the fit for your body rather than being locked into one fit. This matters for active bodies because the fit can change with activity and you need to be able to adjust without the bikini moving. Adjustable straps are essential for keeping everything in place while moving. Adjustable side ties on the bottom mean you can tighten or loosen depending on how you are moving and what you are doing. The adjustments need to be accessible which means they should not be hidden or complicated. These are the sporty bikinis where the adjustable features are built in because actual active use requires actual adjustment capability.