7 points
Many materials like cotton will let sunlight through quite readily, especially when thin or wet. A sun hoodie has 50+ UPF. A cotton shirt that has a similar low thickness will have a mere 5 UPF, making it basically worthless for sun protection. Sun hoodies also often sport features like vents to catch breezes.
1 point
Interesting! I’ve never burned though a shirt but perhaps I’ve been lucky. Maybe I do need to invest in one of these…
1 point