For those wet, dirty jobs, this style provides long-term comfort because the replaceable cork footbed will mold to your feet over time. This style is roomy, but can accommodate narrower feet as well. Made of Polyurethane, a tough, waterproof, biodegradeable, and synthetic material. These shoes are resistant to heat, acid, oil, and grease. They wash up nice with mild soap and water. (Don’t use bleach on white shoes because it turns them yellow.) From the Birkenstock family's Birki's brand.