More ventilated mesh and more Lycra stretch panels. If it's flex, ventilation, lightweight, breathability and long-lasting knees you're looking for in a pant, then put the brakes on...Helium 10000 is super light, full of ventilation from thighs to ankles, and reinforced in the knees. Features include Micro mesh lower leg, reinforced knees with 1680 Denier backed by 400 Denier Nylon, maximum mobility with Lycra crotch and over knee panels, zipper closure, micro injected patch with sublimated nylon side panel and micro injected lower back patch, Lycra stretch panels from behind the knees to around the butt, back ventilated nylon mesh, and ShinSling™ removable neoprene shinguard straps.