The innovative Aqua-Titanium material has been fused into the fabric using Phiten’s unprecedented Phild (pronounced: filed) processing technology. Aqua-Titanium particles will not separate even if the fabric is washed or absorbs perspiration, so please do not concern about moisture. The power of Aqua-Titanium is semi-permanent, which means the effect itself will never go away. Phild processing is applied not only to Aqua-Titanium particles but to all the materials that comprise our Titanium Necklace. Be assured that all Phiten products incorporate Phild processing.