Thanks for replying RemiB, here you have my product page:
<header>
<div class="row show-for-medium-up">
<div class="columns">
{% if settings.product-breadcrumbs-show %}
{% include 'snippet-breadcrumbs' %}
{% endif %}
</div>
</div>
<div class="previous-next row">
{% if collection %}
{% if collection.previous_product or collection.next_product %}
<div class="previous columns large-3 small-6">
{% if collection.previous_product %}
<a class="left" title="Previous Product" href="{{ collection.previous_product}}"><span aria-hidden="true" class="glyph arrow-left"></span> Previous Item</a>
{% endif %}
<div class="border-decoration show-for-large-up"></div>
</div>
<div class="next columns large-3 large-offset-6 small-6">
{% if collection.next_product %}
<a class="right" title="Next Product" href="{{ collection.next_product}}">Next Item <span aria-hidden="true" class="glyph arrow-right"></span></a>
{% endif %}
<div class="border-decoration show-for-large-up"></div>
</div>
{% endif %}
{% endif %}
</div>
</header>
<article class="row" itemscope itemtype="http://schema.org/Product">
<meta itemprop="url" content="{{ shop.url }}{{ product.url }}" />
<meta itemprop="image" content="{{ product.featured_image.src | product_img_url: 'grande' }}" />
<div class="positions active hide-for-js">
<div data-position="title-vendor">
<h1 class="page-title" itemprop="name">{{ product.title }}</h1>
{% if settings.product-brand-show %}
{% assign product_vendor_handle = product.vendor | handle %}
{% if collections[product_vendor_handle].handle == product_vendor_handle %}
{% assign vendor_url = collections[product_vendor_handle].url %}
{% else %}
{% assign vendor_url = product.vendor | url_for_vendor %}
{% endif %}
<h2 class="vendor" itemprop="brand">{{ product.vendor | link_to: vendor_url }}</h2>
{% endif %}
</div>
<div data-position="prices">
<div class="prices">
<div itemprop="offers" itemscope itemtype="http://schema.org/Offer">
<meta itemprop="priceCurrency" content="{{ shop.currency }}" />
{% if product.available %}
<link itemprop="availability" href="http://schema.org/InStock" />
{% else %}
<link itemprop="availability" href="http://schema.org/OutOfStock" />
{% endif %}
<p>
{% assign variant = product.selected_or_first_available_variant %}
<span class="actual-price" itemprop="price">{{ variant.price | money }}</span> <span class="compare-price">{% if variant.price < variant.compare_at_price %}Was {{ variant.compare_at_price | money }}{% endif %}</span>
</p>
</div>
</div>
</div>
<div data-position="photos">
<div class="photos" >
<div class="container clearfix">
{% for image in product.images %}
<a class="photo" href="{{ image.src | product_img_url: '1024x1024' }}" data-zoom="{{ image.src | product_img_url: '1024x1024' }}" rel="gallery" data-image-id="{{ image.id }}">
<img src="{{ image.src | product_img_url: 'grande' }}" alt="{{ image.alt | escape }}" />
</a>
{% endfor %}
</div>
</div>
</div>
<div data-position="thumbs">
<div class="thumbs">
{% if product.images.size > 1 %}
<ul class="clearfix row">
{% for image in product.images %}
<li class="thumb">
<img src="{{ image.src | product_img_url: 'compact' }}" alt="{{ image.alt | escape }}" />
</li>
{% endfor %}
</ul>
{% endif %}
</div>
</div>
<div data-position="cart-form">
<form class="cart-form custom" action="/cart/add" method="post" enctype="multipart/form-data">
<div class="variants {% unless product.variants.size > 1 %}hidden{% endunless %}">
<select id="variant-listbox" name="id" class="medium">
{% for variant in product.variants %}
<option {% if variant.inventory_quantity <= 0 and variant.available == false %}DISABLED {% endif %}{% if variant == product.selected_or_first_available_variant %}selected="selected" {% endif %} value="{{ variant.id }}">{{ variant.title }} - {{ variant.price | money }}</option>
{% endfor %}
</select>
</div>
<div class="quanity-cart-row clearfix">
{% include 'snippet-quantity' %}
<div class="add-to-cart">
<input type="submit" name="add" id="add" value="Add to cart" class="purchase button">
</div>
</div>
</form>
{% include 'snippet-product-unavailable' %}
<br />
<div id="shopify-product-reviews" data-id="{{product.id}}">{{ product.metafields.spr.reviews }}</div>
</div>
<div data-position="description">
<div class="description" >
<div itemprop="description" class="rte-content">
{{ product.description }}
</div>
</div>
</div>
</div>
<!-- Positions & Ordering -->
<!-- Mobile -->
<div class="positions show-for-small columns">
<div data-position="title-vendor"></div>
<div data-position="prices"></div>
<div data-position="photos"></div>
<div data-position="thumbs" class="text-center"></div>
<div data-position="cart-form"></div>
<div data-position="description"></div>
</div>
<!-- Medium Screens -->
<div class="positions show-for-medium-only">
<div class="columns large-6">
<div data-position="title-vendor"></div>
<div data-position="prices"></div>
<div data-position="cart-form"></div>
<div data-position="thumbs"></div>
<div data-position="description"></div>
</div>
<div class="columns large-6">
<div data-position="photos"></div>
</div>
</div>
<!-- Large Screens -->
<div class="positions show-for-large-up">
<div class="columns large-3">
{% if settings.product-position-title-vendor == 'left' %}
<div data-position="title-vendor"></div>
{% endif %}
{% if settings.product-position-price == 'left' %}
<div data-position="prices"></div>
{% endif %}
{% if settings.product-position-form == 'left' %}
<div data-position="cart-form"></div>
{% endif %}
{% if settings.product-position-thumbs == 'left' %}
<div data-position="thumbs"></div>
{% endif %}
{% if settings.product-position-description == 'left' %}
<div data-position="description"></div>
{% endif %}
</div>
<div class="columns large-6">
<div data-position="photos"></div>
{% if settings.product-position-thumbs == 'center' %}
<div data-position="thumbs" class="text-center"></div>
{% endif %}
</div>
<div class="columns large-3">
{% if settings.product-position-title-vendor == 'right' %}
<div data-position="title-vendor"></div>
{% endif %}
{% if settings.product-position-price == 'right' %}
<div data-position="prices"></div>
{% endif %}
{% if settings.product-position-form == 'right' %}
<div data-position="cart-form"></div>
{% endif %}
{% if settings.product-position-thumbs == 'right' %}
<div data-position="thumbs"></div>
{% endif %}
{% if settings.product-position-description == 'right' %}
<div data-position="description"></div>
{% endif %}
</div>
</div>
</article>
{% if settings.product-share-this-show %}
<section class="row social-share">
<div class="columns">
{% include 'snippet-product-share' with 'product-template' %}
</div>
</section>
{% endif %}
{% if settings.product-similar-products-show %}
{% include 'snippet-related-products' %}
{% endif %}
{% if settings.product-modal-enabled %}
<div class="modal">
<div class="loading"></div>
<a aria-hidden="true" class="prev glyph slider-left"></a>
<a aria-hidden="true" class="close glyph cross"></a>
<a aria-hidden="true" class="next glyph slider-right"></a>
<div class="slides"></div>
</div>
<div class="modal-mask"></div>
{% endif %}
<script>
// variables to pass to shop.js
var selectCallback = '';
var product_title = '{{ product.title | escape }}';
var product_variant_size = {{ product.variants.size }};
var product_options_size = {{ product.options.size }};
var product_options_first = '{{ product.options.first }}';
var product_json = {{ product | json }};
// Looking for the selectCallback function?
// You can find it by searching 'selectCallback' in the assets > shop.js
</script>