Rash Guards also known as Surf Shirts from Aeroskin provide excellent protection against UV rays from the sun. Rash guards are made to fit snugly, like a second skin. Normally if you order your T-shirt size then you'll get a good snug fit. If you want the rash guard to fit more loosely then you may want to order a larger size.
These shirts are rated at UPF 50+ Sun Protection by the Australian Radiation Laboratory.
Nylon long sleeve or short sleeve Rash Guard solid black or solid pink.