How do i know this has upf 50 protection? i don't see that claim on the packaging

These are 100% polyester shirts. Ultraviolet is a very short wavelength so the shirt thinness shouldn't be an issue, but even if hanes is exaggerating the UPF claim it's going to be far better than sunscreen in almost all scenarios. If you have a particular skin cancer risk you are going to want to get clothing with the skin cancer foundation seal of approval. A cotton shirt is going to provide like upf 5, which is 5x as much time to burn. Even if outside a lab these are upf 20-30 which would be more inline with a normal polyester shirt (these are certainly some sort of tight weave to get the upf claim) it's going to completely remove your burn risk. The FTC enforces false advertisement claims, but there isn't a US government entity enforcing upf testing standards. If 50+ upf is an absolute must have I would look for a brand that specializes in sun protection or send a sample to a lab for testing. If I had to guess these are right around 50 so they can plausibly claim it was 50+ when shipped.

Does the shirt smell bad after one wear? I'm planning on using it on a 2-week camping trip in a tropical climate with no opportunity to wash it.

Last year on a two week trip to French Polynesia, I wore the two long sleeved shirts nearly everyday for outside activities. The shirts were very comfortable and functional with their sun screen properties. Wuite satisfies with the wear and tear and if the were smelly, I didn't notice and my friends and family either didn't notice a smell or were to tactful to bring it up. Give it a shot you are on vacation.

Hanes

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