Ugly code

I have a Product related to sizes by way of has_and_belongs_to_many.
Currently in my product form partial, I have this really ugly (although
functional) code. Note the hanging ">" that closes the "<input>".

<p><label for="sizes">Sizes</label><br/>
<% for size in @sizes %>
  <input type="checkbox"
         id="<%= %>"
         value="<%= %>"
         <%if @product.sizes.include? size %>checked<%end%>
  > <%= %>
<% end %>

Is there a method that will let me do this and have nicer looking code?
I've had a hard time finding it if there is.