All our NATURAL colored products are completely dye-free, bleach-free, chemical-free, latex-free, and spandex free. However, we utilize special yarns for our colored collections like Black and Melange Colors.  For our Melange Colors, we utilize GOTS-certified 100% Organic Cotton Yarn, knitted to become fabrics. As for our hypoallergenic products dyed in Black, we use 100% Organic Cotton Fiber Dyed Yarn.  You can check the certifications of each material here.  Note: If you have severe skin sensitivities, please opt for our NATURAL colored collection.