In general, any case that fits the iPhone 6 Plus should also fit the iPhone 6s Plus just fine. The iPhone 7 Plus will technically fit as well, though the cutouts won't line up, so live a little ...

Their iPhone 6S cases, which start at $79, are made from a synthetic composite material known as carbon fiber—the same medium that exotic cars, such as Lamborghinis and Ferraris, are made of.