These slim-fit pants with a rubber waist are made on a rare loopwheel knitting machine. They are 100% cotton, softly knitted, and have a comfortable feel and good elasticity. Reinforcements are added to the knees, making them durable for heavy use. Please refer to the link below for product details. https://www.switzul.com/items/26578735 Color...Black系 (Black-based) Stains, tears, odors, etc....None