product-template.liquid

  {% case section.settings.image_size %}
    {% when 'small' %}
      {%- assign product_image_width = 'medium-up--one-third' -%}
      {%- assign product_description_width = 'medium-up--two-thirds' -%}
      {%- assign product_thumbnail_width = 'medium-up--one-third' -%}
      {%- assign height = 345 -%}
    {% when 'medium' %}
      {%- assign product_image_width = 'medium-up--one-half' -%}
      {%- assign product_description_width = 'medium-up--one-half' -%}
      {%- assign product_thumbnail_width = 'medium-up--one-quarter' -%}
      {%- assign height = 530 -%}
    {% when 'large' %}
      {%- assign product_image_width = 'medium-up--two-thirds' -%}
      {%- assign product_description_width = 'medium-up--one-third' -%}
      {%- assign product_thumbnail_width = 'medium-up--one-fifth' -%}
      {%- assign height = 720 -%}
    {% when 'full' %}
      {%- assign product_image_width = '' -%}
      {%- assign product_description_width = '' -%}
      {%- assign product_thumbnail_width = 'medium-up--one-eighth' -%}
      {%- assign height = 1090 -%}
      {%- assign enable_zoom = false -%}
  {% endcase %}
  
  ....
  
  <img id="{{ img_id }}"
                 class="feature-row__image {{ img_class }} lazyload{% unless featured_image == image %} lazypreload{% endunless %}"
                 src="{{ image | img_url: '300x300' }}"
                 data-src="{{ img_url }}"
                 data-widths="[180, 360, 540, 720, 900, 1080, 1296, 1512, 1728, 2048]"
                 data-aspectratio="{{ image.aspect_ratio }}"
                 data-sizes="auto"
                 tabindex="-1"
                 alt="{{ image.alt | escape }}">