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I am a 5'7" woman, weigh 150 lbs, not sure what size arm warmer I should buy. I dress in medium clothes. Would a medium arm warmer fit? Or is this unisex, and I should buy a small?
A MD arm warmer should fit you. If it doesn't we will gladly exchange it for you.
Just ran the 2018 NYC Marathon using C3 Arm Warmer! Very comfortable. Great product!