30, 45 or 50, on a beach bottle: Abbr. NYT crossword clue

On a beach, bottles of sunscreen typically display a number representing their SPF — Sun Protection Factor. This number indicates the level of protection the sunscreen provides against UVB rays, with higher numbers offering greater protection. For example, SPF 30, 45, or 50 are common levels found on sunscreen bottles, each providing varying degrees of defense against sunburn and skin damage.

The clue “30, 45 or 50, on a beach bottle” points directly to this important measure used to assess the effectiveness of sunscreen. The abbreviation for Sun Protection Factor is SPF.