There are 3 main button types described in material design. The raised button is a standard button that signify actions and seek to give depth to a mostly flat page. The floating circular action button is meant for very important functions. Flat buttons are usually used within elements that already have depth like cards or modals.

Raised Button

The raised button is a standard button that signify actions and seek to give depth to a mostly flat page. The floating circular action button is meant for very important functions. Flat buttons are usually used within elements that already have depth like cards or modals.

button settings_backup_restore button gps_fixed button 

<a class="waves-effect waves-light  btn">button</a>
<a class="waves-effect waves-light  btn"><i class="material-icons left">settings_backup_restore</i> button</a>
<a class="waves-effect waves-light  btn"><i class="material-icons right">gps_fixed</i> button</a>

Submit Button

When you use a button to submit a form, instead of using a input tag, use a button tag with a type submit


<button class="btn waves-effect waves-light " type="submit" name="action">Submit</button>
<button class="btn waves-effect waves-light " type="submit" name="action">Reply
  <i class="material-icons left">reply</i>
</button>
<button class="btn waves-effect waves-light " type="submit" name="action">Send
  <i class="material-icons right">send</i>
</button>

Larger Button

This button has a larger height for buttons that need more attention.

Button desktop_mac button cast button

Disabled Button

This style can be applied to all button types.

Button Button add Button 

<a class="btn-large disabled">Button</a>
<a class="btn disabled">Button</a>
<a class="btn-flat disabled">Button</a>
<a class="btn-floating disabled"><i class="material-icons">add</i></a>