DailyMed states that aluminum zirconium trichlorohydrex gly is an active ingredient found in antiperspirants. Wikipedia states that it prevents sweat from leaving the body and obstructs pores in the skin. Because it is anhydrous, it also absorbs moisture.
Wikipedia cautions that when aluminum zirconium trichlorohydrex gly is mixed with sweat, yellow staining can occur. The chemical may also stiffen clothes where it touches. If an excessive amount of the aluminum zirconium trichlorohydrex gly mixes with sweat, there can be a bleaching effect as well. Vinegar or mild bleach can help with the staining.
DailyMed advises that those with kidney disease not use products that contain zirconium trichlohydrex gly. The chemical should not be applied to open skin. Use should be stopped immediately if a rash starts to develop.