SS–S Pull-on Adult Diapers: Waist Sizes and Absorbency | Adult Diaper Information Center Japan

English edition of a Japanese guide by Hiroshi Yagi. Japanese original: first published May 12, 2021; updated October 4, 2026. Read the Japanese original (Japanese).

Smaller sizes from each manufacturer

Availability in size S and below varies by manufacturer and product range. This article compares smaller sizes from several manufacturers. Sales channels and packaging can change, so check the current specifications on the official product page before buying.

Manufacturer	Waist size
LiveDo Corporation	45–60 cm
Kao	45–75 cm
Unicharm	50–70 cm
Kami Shoji	52–75 cm

Examples of smaller sizes from each manufacturer; checked in October 2026.

How to measure waist size

Illustration showing waist measurement at navel height for a pull-on adult diaper; follow the product’s specified measuring point

When choosing a size of pull-on adult diaper, use the waist measuring point and size range specified by the manufacturer or product package.

Products by manufacturer

Product names below are romanizations or descriptive English renderings of Japanese names. They identify products for the Japanese market and are not presented as official international product names.

LiveDo Corporation · Refré

Refré Haku Pants Junior, SS

Size	Waist size	Approximate void-count reference
SS	45–60 cm	Approx. 4 voids

Based on 150 mL per void.

LiveDo Corporation describes this as an intermediate size between baby and adult products, intended for people with smaller bodies.

Source: LiveDo Corporation — official website Japanese

Kao · Relief

Relief Easy Up-and-Down Thin Pull-on Adult Diapers, 3-void Reference, SS–S

Size	Waist size	Approximate void-count reference
SS–S	45–75 cm	Approx. 3 voids

Based on 150 mL per void, as stated by Kao.

Source: Kao — official website Japanese

Unicharm · Lifree

Lifree Ultra-thin Underwear-feel Pull-on Adult Diapers, 2-void Reference
Lifree Thin and Light Pull-on Adult Diapers
Lifree Thin Pull-on Adult Diapers for Extended Use
Lifree Rehabilitation Pull-on Adult Diapers
Lifree Long-use Pull-on Adult Diapers for Use Without an Insert Pad

1. Lifree Ultra-thin Underwear-feel Pull-on Adult Diapers, 2-void Reference · S

Japanese package of Lifree Ultra-thin Underwear-feel Pull-on Adult Diapers, size S, with a 2-void reference — Image source: Unicharm — official website Japanese
Japanese packaging: size S; approximate 2-void reference.

Size	Waist size	Approximate void-count reference
S	50–70 cm	Approx. 2 voids

Based on 150 mL per void, as stated by Unicharm.

Source: Unicharm — official website Japanese

2. Lifree Thin and Light Pull-on Adult Diapers · S

Japanese package of Lifree Thin and Light Pull-on Adult Diapers, size S, with a 2-void reference — Image source: Unicharm — official website Japanese
Japanese packaging: size S; approximate 2-void reference.

Size	Waist size	Approximate void-count reference
S	50–70 cm	Approx. 2 voids

Based on 150 mL per void.

Source: Unicharm — official website Japanese

3. Lifree Thin Pull-on Adult Diapers for Extended Use · S

Japanese package of Lifree Thin Pull-on Adult Diapers for Extended Use, size S, with a 4-void reference — Image source: Unicharm — official website Japanese
Japanese packaging: size S; approximate 4-void reference.

Size	Waist size	Approximate void-count reference
S	50–70 cm	Approx. 4 voids

Based on 150 mL per void.

Source: Unicharm — official website Japanese

4. Lifree Rehabilitation Pull-on Adult Diapers · S

Japanese package of Lifree Rehabilitation Pull-on Adult Diapers, size S, with a 5-void reference — Image source: Unicharm — official website Japanese
Japanese packaging: size S; approximate 5-void reference.

Size	Waist size	Approximate void-count reference
S	50–70 cm	Approx. 5 voids

Based on 150 mL per void.

Source: Unicharm — official website Japanese

5. Lifree Long-use Pull-on Adult Diapers for Use Without an Insert Pad · S

Japanese package of Lifree Long-use Pull-on Adult Diapers for Use Without an Insert Pad, size S, with a 7-void reference — Image source: Unicharm — official website Japanese
Japanese packaging: size S; approximate 7-void reference.

Size	Waist size	Approximate void-count reference
S	50–70 cm	Approx. 7 voids

Based on 150 mL per void, as stated by Unicharm.

Source: Unicharm — official website Japanese

Kami Shoji　Ellemoi Ichiban

Ellemoi Ichiban Thin Pull-on Adult Diapers · S

Size	Waist size	Approximate void-count reference
S	52 –75 cm	Approx. 2 voids

Based on 150 mL per void.

Source: Kami Shoji — official website Japanese

Hiroshi Yagi

A diaper that is too large can leave gaps that lead to leaks. A size that is too small can feel tight and uncomfortable, and the wearer may try to remove it. Check the fit around the waist and legs and choose a size suited to the body.

Where adult and children’s size ranges may leave a fit gap

An example of a large children’s pull-on diaper, shown open from above — An example of a large children’s pull-on diaper.

Hiroshi Yagi

For some wearers, there can be a gap in fit between the smallest adult pull-on diapers and the largest children’s products. Options may include close-fitting cloth underwear with a compatible incontinence insert pad. I would also welcome hearing about the approaches you have found useful.