New With Tags Carhartt Brown Carhartt’s most popular unlined bib, the R01, these heavyweight men's bib overalls were designed using feedback from our Carhartt Crew. Every detail, from the front-to-back kick panel on the cuffs to the extra stretch around the waist, was informed by the hardworking people who wear our gear day-in and day-out. The heavyweight cotton duck material makes them dependable and durable. Elastic suspenders, a double layer at the knees, and ample pockets provide even more durability and functionality. Compatible with the Carhartt Knee Pad.