Mineral active ingredients (zinc oxide and/or titanium dioxide), no fragrance, and a short ingredient list are the key markers. These actives sit on the skin's surface rather than absorbing in, which lowers the risk of reaction compared to chemical UV filters.
Mineral sunscreen is generally the safer starting point for sensitive skin because it uses physical blockers (zinc oxide, titanium dioxide) instead of chemical UV filters, which are a more common irritant trigger. No-Show™ Mineral Sunscreen SPF 50 is untinted and formulated for this reason.