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A marathon is a long race, and it is often as much as 20 degrees colder at the start than it will be at the finish several hours later. To keep comfortable on a chilly morning, bring a throwaway t-shirt to wear as an extra layer for the first mile or two, or for however long it takes you to feel comfortable. You can use one of those old cotton t-shirts that you don't wear for running; you will discard it before it gets clammy. If you can't part with any t-shirts from previous races, an old undershirt or an old windbreaker will do, as will a trash bag (see tip on trash bags for details).