I had a white under armor heat gear shirt that worked great.

It kept the sun off and wasn't oppressively hot. I highly recommend the heat gear line. I also use the heat gear tights on a daily basis.

It was similar to these:

https://www.underarmour.com/en-ca/me...pid1259673-410

https://www.underarmour.com/en-ca/me...pid1269285-040

https://www.underarmour.com/en-ca/me...pid1272218-040

https://www.underarmour.com/en-ca/me...pid1264088-400

https://www.underarmour.com/en-ca/me...pid1271842-001