Improper fitting between peristomal body profile and ostomy product(s) is one of the main reasons for leakage among individuals with an ostomy. The aim of this article was to evaluate clinical usability of the Body Assessment Tool developed by Coloplast that is available free of charge. The aim was also to study how changing to product(s) that were best suited to an individual, guided by peristomal body profile, affected the number of leakages and individuals' quality of life.