Most Nike men’s swim shorts run true to size in the waist, so starting with your usual Nike bottom size is typically the best move. That said, the right choice depends on how you want them to feel once they’re wet: a snugger, sporty fit will feel secure for swimming, while a slightly roomier fit can feel more comfortable for lounging or wearing over compression liners.
If you prefer a clean fit through the waist and seat, or you plan to actually swim (not just hang by the pool), sticking with your regular size is usually ideal. Nike swim shorts commonly include an elastic waistband and drawstring, which lets you fine-tune the fit without needing to size up. True-to-size also helps prevent the shorts from riding down when the fabric gets heavier in water.
Consider sizing up if you’re between sizes, have larger thighs, or want extra space for walking, sitting, and all-day wear. Sizing up can also help if you prefer longer inseams to drape a bit looser through the leg. If you hate any tightness at the hip line or you plan to wear the shorts higher on the waist, going up one size can feel noticeably more relaxed.
Try them on dry and do a simple test: tie the drawstring, squat, and take a few wide steps. You want comfortable movement without the waistband biting. If you have to loosen the drawstring all the way to breathe or sit, size up; if they slide with the drawstring tied, stay true to size or size down.
For a deeper breakdown on fit, styling, and care specifics, see the full guide here: https://spiritine.com/guide-nike-mens-light-blue-swim-shorts-fit-care-style/.
Measure your natural waist where the waistband sits, then compare it to the brand’s size chart. If you’re between sizes, choose based on how fitted you want the waist and how much room you need in the thighs.
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