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updated 6/19/2013 12:57:41 AM ET 2013-06-19T04:57:41

In some areas (like Bryce Canyon in July, for instance), you can be hiking through frost-covered trails in 35 degree weather in the morning, and then find yourself baking in mid 80s temps by mid afternoon. Layers aren't just a good idea here, they're a necessity. But jackets that can handle these temps, and below, [...]

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