Size Calculation

iSwim Exclusive Quick Size Calculation

Size Chart

iSwim Fashion size chart for underwear and swimwear, please measure 10-12cm under the navel, or aoround your hips if Non Asian

iSwim underwear is made with our own special two-stage stretchy method. The first stage is the standard range in the size chart, and the second stage is the tighter range.
If you prefer underwear that is comfortable and not tight, it is recommended to refer to the standard stretch range to choose your size, lower rise underwears (for example: Ultra Low, Extreme Low), or a slightly less stretchable fabric, may to consider a slightly larger size. If you between two sizes, we recommend that you use our [Little Modification] service.
We may recommend you to choose the one size larger if you are Non Asian.

Quick Calculation Of Size

iSwim Fashion exclusive Quick Calculation method, it is not suitable other brands

For iSwim bikinis, we have defined a quick calculation method that you can use to quickly calculate the right size for you.
If your size is M after calculated, but your height is 172cm or more, or your hips and legs are thicker and you are worried about a too tight suit, or your are Non Asian, we recommend you to choose L size when ordering your first suit, Or use our [Little Modification] to increase or decrease the waist size.
Sizing recommendations for swimwear: There are 5 sizes of iSwim swimwear. The waistband of the swimming trunks will be tighter than the underwear to prevent them from loosening during swimming. A size M swimwear is the same size as a size M underwear, and a size XL swimwear is the same waist size as a size L.
- If your underwear size is M and you are used to a slightly tighter fit, you can also choose M for your swimwears. If you are not used to tighter fit, it is recommended that you choose at least size L.
- If your underwear size is L, the corresponding swimwear size is XL. If you are not used to tight fitting, you can choose XXL.
iSwim bikinis use different manufacturing methods than commercially available products to improve the overall fit. Therefore, when the cutting, material (or color) is different, the width of the suits will be slightly different when on flat, therefore we do not recommend the other brands method that use the flat width to determine size, and do not need to ask us how much cm on flat of waist.
iSwim underwear and swimwear are only made to order, and returns and exchanges are not available. If you have any questions about size selection, it is recommended that you consult customer service first (it is recommended to provide your height and weight, low waist circumference, and tight fitting habits).

Note

iSwim's quick calculation method does not apply to other brands, please pay attention.