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Below you will find instructions on how to properly select a size for our products. If you have any questions please contact us as we do not accept returns on our products due to their sanitary nature.


For covers it is recommended that you find a sizing where you fall closest to the middle of the range listed. Otherwise it may be too loose or too tight. If you plan to wear the pant over a diaper or other garment, we recommend taking any measurements while wearing it.

Disposable Briefs

Manufacturers list the absolute minimum and maximum size the diaper will adjust to fit while laid on a flat surface. These measurements do not take into account body shape, weight, or height. The larger measurement of the hip/waist must be used for sizing purposes.

If a brief lists an upper range of 44", this measurement is with the tapes JUST touching the edges of the front of the brief. If you want just 2" of overlap on each side for example you will need to deduct 8" from the maximum to asses a realistic fit. So if you have a 36" waist it may or may not be a good fit depending on other factors. It is always best to order a trial pack or bag before buying a large quantity of a new brand or style.

Cloth Diapers

These are more forgiving or true to size. The fasteners are also much more durable than disposables. You will be most comfortable in products where you do not fall too close to the upper or lower range of the size listed. Every product fits differently so it is best to order one and wash it a few times to asses the fit after shrinkage before purchasing a large quantity.

Snap Suits/Diaper Shirts

Rearz brand snapsuits contain spandex and are quite stretchy. For length, you will want to measure from your shoulder to bottom of your crotch over top of your briefs. When it comes to snapsuits, length is the most important measurement. The chest can usually stretch up to 20%, making it the 2nd most important measurement.

General Sizing

Measurements listed on our site generally refer to the measurements of the garment and not the measurements of the individual that it will fit.  Keep in mind when there is a size range a garment will fit most comfortably if you fall closer to the middle of the range.