Ronhill Flash Armwarmers. Had these given to me as a Christmas present and I have so say even though they seem thin they are surprisingly warm. Really pleased with them. They are great for extending your running wardrobe between seasons. Here is some sizing info the length is the same on both sizes 18" (just past the knuckles) The top of the armwarmer s/m is 4 1/2 inches flat & m/l is 5 1/2 inches flat.
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