Rash Guards

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Is a T-shirt not UV blocking?
Depends on the material and construction and color of the T-shirt. A standard cotton T-shirt is typically not sun blocking - and gets even worse when wet. A poly/spandex T-shirt is often better. With UPF-protected clothes, the weave is different and often times is made from a special fabric to help form a barrier against the sun's rays. UV light can penetrate through the micro holes in the weaves of regular clothes or can even travel directly through a light-colored shirt.
 
The comfort topside between dives, especially when windy or on a moving boat, is the big win for rashguards.

Rashguards are skin tight and can also be worn under a wetsuit…to guard against rashes! :) This gives you sun and wind protection between dives when you peel down the top portion of a one piece wetsuit.

Rashguards dry *fast* between dives, especially while you are still wearing them.

If you are a one-and-done diver, or if you immediately remove your wet T-Shirt before the boat starts moving, a cotton T-Shirt might be just fine.

But in general, Rashguard > T-Shirt
 
Rash guards are great if you want to cover up logos on the chest or if you want to protect Velcro from wearing away the collar on some BCDs. They are also useful if you're wearing a pure harness and want to protect the wetsuit from abrasions.
 

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