Rotomolded cooler vs injection-molded cooler: Rotomolded wins for direct sun

Rotomolded coolers (Yeti, Pelican, RTIC) have thick polyurethane foam and airtight gaskets that block heat transfer far better than cheaper injection-molded coolers with hollow walls. White or light colors reflect sunlight, so go with those for direct sun. Pre-chill the cooler the night before for extra hours of ice retention.