Rugged Flex Double Knee Relaxed Fit Jean by Carhartt. 

• 12-ounce, 85% cotton/14% polyester/1% spandex denim
• Rugged Flex® durable stretch technology for ease of movement
• Sits slightly below the waist
• Relaxed seat and thigh
• Double front with cleanout openings that accommodate knee pads
• Multiple tool and utility pockets
• Stronger sewn-on-seam belt loops
• Straight leg openings
• Number of belt loops varies based on size