Runner's Butt (Patreon)

Expanstik Anti-Chafe stick for athletes. It's patented technology converted friction into air pockets rather than cause chafing. Unfortunately, as the user got bigger, the surface area of their body also increased, and so the amount of friction became exponential.

Only temporarily recalled so the company can rework the chemical components; the current version seeps into the skin and has a permanent effect, which is bad business for a company that wants repeat customers.

Thanks Blimpstrid for the idea - I know it's not exactly what you had in mind, I tweaked it a bit, I hope that's not a deal breaker for you!