Zoot IceFil Arm Coolers Stay Cool with IceFil, a Multi Step Skin Cooling Technology, Xylitol. You will feel the cooling comfort in warm, humid weather conditions. IceFil works in three steps, it cools by up to 5%. It first blocks thermal radiation from I.R., then it discharges thermal radiation with Xylitol and controls moisture and sweat by the use of the fabric. The fabric is fast drying, has 2 way air circulations, it is anti-bacterial, and provides U.V. protection and is moisture absorbing and fast drying! So go out and ride and keep your arms protected and cooled down!