Spacing Between Rows with Materialize CSS

Use These Methods:

.row .col{
    padding: 0 !important;
}

Then the problem with unwanted space will be go away. Next you can add any other style to your div

I did this to make fast space with clear and margin if i need to.

<div class="clear-10"></div>

.clear, .clear-10, .clear-15 {
  clear: both;
  height: 0; overflow: hidden; /* Précaution pour IE 7 */
}
.clear-10 {
  margin-bottom: 10px
}
.clear-15 {
  margin-bottom: 15px
}

I figured it out. Put each col within a single row will eliminate the vertical spacing.

<div class="row">
  <div class="col s12" style="text-align: center;">
    foobar
  </div>
  <div class="col s12" style="text-align: center;">
    12345
  </div>
</div>

It is confusing but it works. Conceptually, I would think that a "row" is like a table row, forcing everything inside it to be on a single row regardless of size, but this does work since each col has s12 (full width) size. Hope this answer helps someone else.