waterproof bib made from recycled polyester. the the north face freedom bib pants come with a chimney ventingâ„¢ system to ensure a perfect climate. the waterproof, breathable and seam-sealed dryventâ„¢ 2l fabric keeps you dry, while ventilation holes on the inner thighs provide a cool breeze. features like stretchventâ„¢ elasticated gaiters, chest pocket with hook and loop closure, pre-shaped knees and reinforced cuffs, make every day on the mountain even better.these pants are made from 57 % recycled nylon.