Karastan’s SmartStrandÂ® carpets â€“ gorgeous can go green. Permanant, built-in stain protection, cleans with water and mild detergents, durable and environmentally sound. Karastan believes we all have a part in making the right choices for our environment. That’s why we created a carpet made in part from crops. Smarter resources, smarter processes, smarter carpet… SmartstrandÂ®.