They stretch to let you move, they're adjustable for the perfect fit, and reinforced hems keep them stronger for longer. Ared V02 20000 polyester 4-way stretch fabric with DWR finish Taped seams High loft polyester insulation Warm touch lining to upper legs Adjustable detachable braces with front slider system Elasticated waist adjusters 2x side zipped pockets Warm scrim pocket lining Articulated knee design Reinforced binding at hem Tab up hem Grow cuffs at hem Integral snow gaiters Reflective detailing