There are two sizes of natural wave closure to choose from: 4×4 and 13×4. Smaller-sized natural wave closure will blend well with your original hair, while larger-sized natural wave closure will add volume and create a beautiful hairstyle. And there are two kinds of lengths:10-20 and 8-26 inches. Long-length natural wave closure looks elegant and stylish, short length natural wave closure looks beautiful and natural. You can choose the sizes and lengths according to your needs.