The Castelli Thermoflex Arm Warmers is a seasonal favorite to many cyclists due to the uncluttered design, solid construction and superb performance of the Thermoflex fabric. These warmers have a snug yet super comfortable anatomic fit that will have not bunching or gathering of excess material in the action areas of the garment.
The interior of the arm warmers have plush and inviting brushed fleece whose duplicate task provides thermal value and moisture management through perspiration wicking. The fleece has tiny filaments, each with hollow cores to trap heat and keep it against your skin, while the porous nature of the Thermoflex fabric allows for simultaneous breathability. Thin silicone grippers on the inside of each end of the warmer do a good job at keeping these in place while cycling.