The 18 quad weft clip in hair extension gives ultimate thickness and volume with each voluptuous hair piece containing four wefts of hair each quad weft hair extension gives you the thickness of four regular hair wefts and is compacted down into just one clip in piece the quad weft extension is designed to give you more volume per weft allowing you to have thick fuller looking hair only 100 remy human hair is wefted down onto our unique lace system which holds down the four wefts of hair