Does anyone know what "age in place backers" mean on a Kohler Shower Stall"?

Kohler has two models that are identical. But, one has age in place backers and is $60 more. I can not find anything about what this is. Can anyone help? Thanks!|||Age in place refers to handicap accessible options. See Sources for the link @ Kohler.|||Call Kohler and ask them or call a local plumbing company.