10% Mandelic Acid + HA provides gentler superficial skin exfoliation than other AHAs. The molecular weight of mandelic acid is 152.1 daltons which is larger than other alpha hydroxy acids (glycolic acid is 76.0 daltons for example). This larger size allows mandelic acid to penetrate the skin more slowly making it very gentle and suitable for all skin types. You don't need a concentration of more than 10%, because you will simply achieve indirect peeling power that can be more easily provided by lower percentages of glycolic acid.
