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Wear this 40 UPF pullover on cool mornings (Columbia Climber Canyon Hoodie Tunic, $60, columbia.com for info) and get support from this UV-protective tank's built-in bra (Nike Print Strong and Strappy, $40, niketown.com). Plus, comfy 30 UPF shorts make your strides easier (Lands' End Sun.Life Shorts, $32.50, landsend.com).
What Is UPF?
An Ultraviolet Protection Factor (UPF) seal means the fabric blocks UVA and UVB rays. To earn a UPF label, clothing must undergo tests for both initial UV protection (determined in part by the tightness of the weave, the weight, the type of fiber, the color, and the amount of skin covered) and protection after two years of use. Most high-tech performance wear is specially treated with chemical UV absorbers, which partially block UVA and UVB rays. In addition, some fabrics are treated with a chemical sunblock.