We found the best testing of adult diapers at XPMedical.com. This retail website conducts lab tests and includes balanced reviews on the brands it sells. We found good general information at IncontinenceSupport.org, although the ratings were of brands rather than specific diapers. We found few user ratings on Abena Abri-Flex Disposable Underwear, but we found few user reviews in general for adult diapers.
Disposable underwear isn't as absorbent as briefs-style adult diapers, and thus is better for people with mild incontinence. Given that caveat, the Abena Abri-Flex pull-on style disposable underwear gets excellent ratings. Other reviewers give high ratings to Abena adult diapers in general, though they cost more than other brands. Disposable underwear's main advantage over briefs-style diapers is that they are not held in place by tape or Velcro, and thus are easier to pull down and pull up. However, they are not as snug and are more prone to leaks. If your incontinence is moderate to severe, reviewers most frequently recommend the high-absorbency Abena Abri-Form X-Plus (*est. $15 for a package of 14 medium), which attaches with tape in four places.
1. XP Medical.com
XPMedical.com, a retailer website, tests the diapers it sells in a laboratory for absorbency, and includes notes on fit as well. The Abena Abri-Flex Extra is rated as most absorbent among underwear-type adult diapers.
Review: Abena Abri-Flex Disposable Protective Underwear, Gary Evans
IncontinenceSupport.org gives ratings in nine performance categories to a wide selection of adult diaper brands, but doesn't specify which model of each brand was tested or say how testing was conducted. Abena gets very good or good ratings in every category except an "average" for the plastic backing strength.
Review: Abena, Editors of IncontinenceSupport.org