Invisible Seamless Blend: GOO GOO Genius Weft hair extensions provide a flawless, natural look. The ultra-thin weft design lies flat against the scalp and blends easily with the hair. It has a flat effect after wearing, making it ideal for daily use and special occasions Ultra-Lightweight & Soft: Our Genius Weft extensions made from ultra-light materials, offer a soft weft for added comfort. You won't feel heaviness or discomfort, even during long wear, allowing you to enjoy beauty with unprecedented relaxation Genius Wefts vs Traditional Wefts: Our Genius Weft hair extensions combine the advantage of hand-tied and injected wefts, no return hair for no scalp irritation, matting. They’re thinner, cuttable to your desired width, and can be applied using sewing, clips, or glue for a secure, custom fit Specifications: Whether you desire 14 inch (40 g), 16-18 inches (50 g) or 20-24 inches (60 g), our Genius Weft human hair extensions ensure a tailored fit. If your hair is thick, need 2 packs, If your hair is thin, need 3-4 packs. Of course, you'll need the help of a professional Hair Care: Keep your extensions smooth and shiny by following proper care. Use a wide-tooth comb from bottom to top to prevent tangling. For best results, pair with conditioner to extend your extensions' life. Full instructions are in our haircare manual