The recommended way to use the Material Icons font is hosted by Google Fonts, available here:
<link href="https://rs.http3.lol/index.php?q=aHR0cHM6Ly9mb250cy5nb29nbGVhcGlzLmNvbS9pY29uP2ZhbWlseT1NYXRlcmlhbCtJY29ucw"
rel="stylesheet">
Read more in our full usage guide: http://google.github.io/material-design-icons/#icon-font-for-the-web