{% if product.show_variants? %}
  <div class="product-variants">
    <select name="variant_id" id="variant-select">
      {% for variant in product.variants %}
        <option value="{{ variant.id }}">{{ variant.title | escape }}</option>
      {% endfor %}
    </select>
  </div>
{% else %}
  <input type="hidden" name="variant_id" value="{{ product.variants.first.id }}" />
{% endif %}