When you're braving chilly fall breezes and scattered drizzle on an early morning ride or swooping down your favorite canyon road, you don't want just any old set of arm warmers. You want the Santini H20 Behot Arm Warmers. Made from Santini's Behot fabric, these arm warmers boast the distinctive ability to actually create warmth as you ride. In addition to its standard insulating properties, Santini claims the Heat Generating Technology of this fabric can produce up to four additional degrees Celsius of heat as your body moves. On the outside, Santini add an Acquazero treatment for durable water resistance while retaining breathability so you'll stay dry no matter the weather or the interval effort. Jacquard elastic and silicone grippers at the hems softly and securely hold the warmers in place so you can focus on the ride without any worries of exposed skin patches or uncomfortable bunching.