Constructed from three-layer Proflexâ„¢ Kinetic 2.0 fabric, it uses an internal PU membrane, sandwiched between a durable nylon woven outer and a soft, fast-wicking inner. While that delivers outstanding stretch and breathability for fast-paced scrambles, the slim, athletic cut offers extra usability thanks to expandable cuffs for larger boots and articulated knees for easy movement. The adjustable elasticated waist uses a secure silicon grip and the ankles and hem use heavier woven reinforcements to increase durability.