[Sun Care] Got upf 50+ clothing but I can see my fingers through it when I hold it up to the light?

Beauty Tips For Body Care
My understanding is that normal clothing provides insufficient protection from the sun because of small holes in the weaving, which lets in uv rays.I recently bought a upf hoodie from Baleaf thinking that the material would be tightly woven to prevent any light from penetrating to skin, but when I held the thing up to the sunlight I could clearly see the outline of my fingers. I tested one of my regular cotton shirts and was surprised to see there wasnt much of a difference between the two.Is there something I'm missing here?
Girls Blog 2015
Submitted by LegitimateSoftware