SPF Best UV filter Anti-Ageing SPF opis Most commonly seen as SPF followed by a number, it is a rating system assigned to a product that identifies the amount of time it can protect the skin from sunburn or from turning pink or red when exposed to sun. In Europe the SPF factor is calculated according to ISO 24444.. Because sunburn results from UVB radiation, not UVA radiation, SPF is primarily a measure of UVB protection; however, sunscreens rated for broad spectrum protection can protect from UVA rays, too. Powiązane składniki: Sun Protection Factor