Adult Diaper Information Center Japan / YOUR QUESTIONS
Check why the fit feels tight or loose.
First identify the diaper type, then compare the size information for pull-on adult diapers and tape-fastened adult diapers.
First, identify the diaper type you use
Pull-on adult diapers and tape-fastened adult diapers differ in how they are put on and which body measurements to check.
Pull-on adult diaper basicsPull-on adult diaper basicsPull-on Adult Diapers: Types, Sizes and Precautions When Using Insert Pads [2026]Review features, sizing and precautions for combining the diaper with an insert pad.Read the article 
Tape-fastened adult diaper basicsTape-fastened adult diaper basicsTape-Fastened Adult Diapers: Types, Sizes, Fastening and Precautions When Using Insert Pads [2026]Review features, sizing, tape fastening and use with insert pads.Read the article If you use pull-on adult diapers, compare smaller and larger products.
Smaller and larger pull-on adult diapers
Compare labeled waist ranges with the fit when worn.
For pull-on adult diapers, check each product’s waist measurements and the fit when worn.
Smaller pull-on adult diapersSmaller pull-on adult diapersSS–S Pull-on Adult Diapers in Japanese Retail Ranges: Waist Sizes and Absorbency by Manufacturer [2026]Compare SS–S products by waist measurements and absorbency.Read the article 
Larger pull-on adult diapersLarger pull-on adult diapersLarger Pull-on Adult Diapers: Sizes L and Above from 6 Retail Manufacturers in Japan [2026]Compare sizes L and above using size ranges and reference absorption counts.Read the article If you use tape-fastened adult diapers, compare labeled hip ranges.
Smaller and larger tape-fastened adult diapers
Compare labeled hip ranges with the fit after fastening.
For tape-fastened adult diapers, check each product’s hip measurements and any gaps after fitting.
Smaller tape-fastened adult diapersSmaller tape-fastened adult diapersSS and S Tape-Fastened Adult Diapers: Features and Selection Points from 4 Retail Manufacturers in Japan [2026]Compare SS and S products by features and points to check when choosing.Read the article 
Larger tape-fastened adult diapersLarger tape-fastened adult diapersLarger Tape-Fastened Adult Diapers: Hip Sizes and Reference Absorption Counts from 6 Retail Manufacturers in Japan [2026]Compare larger products by hip measurements and reference absorption counts.Read the article If you are looking for thin tape-fastened adult diapers, open the dedicated comparison article.
Check ultra-thin tape-fastened adult diapers
Review product examples of tape-fastened adult diapers designed to be thin.
Check size and the absorbency needed as well as thinness.
If you are still unsure after reading
Telephone and chat advice services are also available. Check the article and each provider’s guidance for how to contact them.
