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Early morning runs, unexpected weather conditions on the back nine, biking your favorite forest trail or making your living on the golf tours. Extreme, abacus’ most versatile, technologically advanced, light weight and state of the art collection have you covered. 37.5 Technology®, Stretch Lite®, Thermocool® and DryCool Zero are some of the technologies we use in our X-series Collection. You stay as comfortable as possible no matter what you are doing.