In PrestaShop, product attribute values (like size, color) appear in the URL because of combinations and the rewrite (friendly URL) system.

Example URL:

/t-shirt/12-tshirt-blue-xl.html

Here blue-xl comes from attribute values.

If you want to hide attribute values from the URL, you have several options:

✅ Method 1: Disable Combination Rewrite in Core (Recommended Safe Override)

By default, PrestaShop appends combination names to the URL when:

• Product has combinations
• Friendly URL is enabled

🔹 Solution: Override Link.php

1. Go to:

/override/classes/Link.php

If not exist, create it.

2. Override getProductLink() and remove combination rewrite part.

Example:

class Link extends LinkCore
{
    public function getProductLink(
        $product,
        $alias = null,
        $category = null,
        $ean13 = null,
        $id_lang = null,
        $id_shop = null,
        $ipa = 0,
        $force_routes = false,
        $relative_protocol = false,
        $add_anchor = false,
        $id_product_attribute = 0,
        $extra_params = array()
    ) {
        $id_product_attribute = 0; // Force remove combination
        return parent::getProductLink(
            $product,
            $alias,
            $category,
            $ean13,
            $id_lang,
            $id_shop,
            0,
            $force_routes,
            $relative_protocol,
            $add_anchor,
            0,
            $extra_params
        );
    }
}

3. Clear cache:

Advanced Parameters → Performance → Clear Cache

Now URLs will be:

/t-shirt/12-tshirt.html

No attribute values.

✅ Method 2: Disable Friendly URL (Not Recommended for SEO)

Go to:

Shop Parameters → Traffic & SEO

Disable:

Friendly URL = No

But this gives:

index.php?id_product=12&controller=product

❌ Not SEO friendly.

✅ Method 3: Remove Combination Anchor Only

Sometimes attribute is not in URL but after #:

/t-shirt.html#/2-size-xl

That part is handled by JavaScript.
To remove it:

Edit:

themes/your-theme/assets/js/product.js

Remove or modify:

window.location.hash = ...

✅ Method 4: Force Canonical URL (Best for SEO)

Instead of hiding completely, you can:

• Keep combinations working
• Force canonical to base product

Edit product.tpl:

<link rel="canonical" href="{$link->getProductLink($product.id_product)}">

This keeps SEO clean.

⚠️ Important Warning

If you remove combination from URL:

• Google indexed combination URLs may break
• Price updates via combination may not work correctly
• Some themes rely on id_product_attribute

Always test on staging site first.

🎯 Best Practice (Recommended for You)

Since you are working on PrestaShop speed optimization, I recommend:

✔ Keep friendly URLs
✔ Remove combination rewrite via override
✔ Add canonical to base product
✔ Keep combinations working with JS