STRETCH-IT™ Chat Noir Socks We fulfilled our number one customer request and developed proprietary technology to create our awesome designs on stretchier socks—up to 21 inches in circumference without distorting the graphics. Our custom built machine creates a higher thread count knee high that won’t fall down, no matter your leg size. One of our best sellers Chat Noir is now available in our unisex STRETCH-IT™ size. We already knew that cats are the world's best stretchers, but these knee high socks might even put their stretch to shame. Smoke-free home.