These Carhartt Rugged Flex Unlined Rigby Bib Overalls are made using an 8-ounce 98% cotton/2% spandex canvas. for greater mobility, these Carhartt bib overalls feature Rugged Flex durable stretch technology. The cotton bib overalls also have elastic suspenders on an adjustable front for a more personalized fit. There are many places to store important items on these flexible bib overalls, including two large lower-front ledge pockets, two reinforced back pockets, two additional storage pockets, and a right-leg secure cell-phone pocket.