XC Pro Pant. The redesigned KLIM XC Pro Pant, now in its second generation, is a streamlined, premium off-road pant born from rigorous racecourse testing. With new UHMWPE knee and seat fabrics, new main chassis materials, upgraded laser-cut holes and new knee intake vents, the XC Pro is now faster, more durable, more comfortable and significantly lighter than ever before. With a slim athletic fit, no hanging liner, stretch fabrics, and a cell phone pocket, these pants are custom-engineered for performance on the bike. Shell / Construction: Stretchy, extremely mobile in-the-boot off-road pant. UHMWPE stretch fabric on knees and seat for extreme durability. Goat leather on inside of knees for grip / protection. Zeromelts® Flame Retardant DuPont™ Kevlar® lower inner knee for low bulk heat protection. Seat has mesh backer for durability.