The box shape and mat are two major trends in nails. We love both styles and that also goes for celebrities like Rihanna. Not only do the two look stylish, but also when worn together. By choosing matte box nails, you have one trendy manicure and you don’t have to choose between two great styles. With that said, we’ve found 21 of the best matte coffin nails. We have something for everyone – from bold colors for fall to glittering glitter colors for summer.