SPF, short for Sun Protection Factor, is widely used for cosmetic products.
UPF, short for UV Protection Factor, is for textiles or fabrics. The higher the rating, the better the sun protection.
When compare the performance of sunscreen and UPF clothing, studies have shown that UPF clothing blockes more UVA rays and UVB rays than sunscreen.
For outdoor activities in summer days, it's recommended to wear upf 50 clothing and sunscreen on face, neck and arms to protect against sunburn.