sections/product-template.liquid

{% assign image_url = image | img_url: 'master' | replace: '_1x1.', '_{width}x.' %}

                        <img class="Image--lazyLoad Image--fadeIn"
                                 {% if initial_image_id == image.id %}src="{{ image | img_url: 'master' }}"{% endif %}
                                 data-src="{{ image_url }}"
                                 data-widths="[{{ supported_sizes }}]"
                                 data-sizes="auto"
                                 data-expand="-100"
                                 alt="{{ image.alt | escape }}"
                                 data-max-width="{{ image.width }}"
                                 data-max-height="{{ image.height }}"
                                 data-original-src="{{ image | img_url: 'master' }}">