Looking for a great thermal arm warmer? Castelli has broken out their warmer line into thermal and protection options. The Thermoflex 2 series goes back to insulation and comfort with top breathability. Perfect for cool dry weather, the Thermoflex 2 Armwarmer pair weighs only 61 grams. The Thermoflex fleece fabric is warm, stretchy and soft, and is a single piece construction with a smooth flatlock seam and cuffs.

Holding the warmer in place on the upper bicep, dual-sided silicone gripper elastic prevents sliding down, utilizing the skin and jersey/layer material. Rated for a 46°-68°F range, this arm warmer is a crucial component of every cyclist's wardrobe.