Certain Dri vs. Clinical Showdown: 72hr Sweat Control, Tested Free... This Summer’s Smart Choice We’ve spent the past few weeks battling the heat with Certain Dri’s prescription-strength antiperspirant, and the results have been nothing short of impressive. Unlike off-the-shelf options, our 1.2 fl oz roll-on delivers 72-hour protection, allowing us to breathe easier between applications. The fragrance-free formula is a win for those who prefer an unscented finish, and the clinical-grade ingredients mean sweat control is real. We found it particularly effective in high-pressure situations, keeping underarms dry even during long commutes or outdoor events. While it’s pricey for prescription strength, the convenience and longevity make it worth the investment. Plus, it’s unisex, so both partners can benefit from the same reliable protection. So far, Certain Dri stands out as our go-to solution this summer.