"Aluminium-free antiperspirant" as a product category is largely a marketing construct — there's no effective way to block sweating without aluminium salts. But effective odour control without aluminium is absolutely achievable. You just need a product that works at the right level.

Most aluminium-free deodorants are still surface-level products with the same fundamental limitation. SKYNZ works on the odour-causing bacteria, which is why the duration and reliability are categorically different.