Stormr Foul Weather Bibs are made of the same waterproof and windproof neoprene that are found in their jackets. If you want a serious pair of bibs, then Stormr is the way to go. Stormr Foul Weather Bibs are made of high quality materials and attention is paid to the details - making pockets waterproof, reinforcing the knees and creating a fully adjustable waist, ankle cuffs and shoulder straps. Stormr Bibs also provide 5 lbs of bouyancy in case you find yourself in the water. Stormr Foul Weather Bibs are great!