Alpinestars Fluid Pants The Fluid Pants offer optimized levels of comfort and performance in the riding position, thanks to their lightweight chassis, lower waist stretch panels and pre-curved leg design. Developed and tested on some of the toughest terrains around the globe, the sport fit Fluid Pants are ideal for many forms of off-road riding. 600D poly-fabric main chassis construction that is PU coated for strength with a technical yearn for durability. Stretch fabric panels on crotch, knees and rear waist for enhanced rider comfort. 3D pattern construction for additional rider comfort and unparalled freedom of movement. High performance synthetic leather on knees for heat resistance, grip and comfort. Ratchet closure for a secure, personalized fit. Comfort mesh lining for superior breathability.