I found myself in a situation where using the solution selected
$(document).ready(function() {
$('select').material_select();
});
for whatever reason was throwing errors because the material_select() function could not be found.
It was not possible to just say <select class="browser-default...
Because I was using a framework which auto-rendered the the forms.
So my solution was to add the class using js(Jquery)
<script>
$(document).ready(function() {
$('select').attr("class", "browser-default")
});