Ideal core heat and performance with the Infiniti Comp X2. The Infiniti series is the workhorse in the Xcel range. It offers the perfect balance of warmth and stretch. The Radiant Rebound core locks out the cold while radiating body heat back inside. ThermoLite IR is used on the lower interior for added stretch and warmth. The exterior is Channel Flex on top and Ultra Stretch on the bottom.