The Under Armour Heather Swiftbrook Insulated Pant will keep her warm and comfortable even on the deepest days. It features a waterproof, breathable construction, with 10k/10k protection, so she's sure to stay dry whether she's skiing the deeps or falling into them. Thinsulate insulation is low-bulk, so she stays warm without feeling clunky, but there's still room beneath the regular fit for layers on super frigid days. Built-in boot gaiters keep powder from chilling her ankles, and the cuffs also feature reinforced fabric to ward of the ruinous edges of her skis. Adjustable waist tabs help her find the perfect fit, and extra fabric in the legs can be let out if she experiences an unexpected growth spurt.