Stealthskyn is patent pending and is a proprietary synthesis of naturally occurring and synthetic nanofibers of 85% polyester/biosynthetic and 15% lycra/elastine. More details below: we currently use both natural and man-made fibres we are eco friendly we are creature friendly our fabrics are 100% safe on humans we are hypo-allergenic and friendly to all types skin our fabrics do not contains any metals or any harmful elements to the body