Here you are : {navigate to="current"}<br />
From : {navigate to="return_to"}<br />
Index : {navigate to="index"}<br />

<h1>Product page</h1>

{ifloop rel="product"}

{loop type="product" name="product" current="true"}

<div style="border: dashed 2px red; padding: 20px; margin: 10px;">
    <h2>PRODUCT ({$ID}) : {$REF}</h2>
    <h3>{$TITLE}</h3>
    <p>{$DESCRIPTION}</p>

    <p>Starting by {$BEST_PRICE} € HT (TAX : {$BEST_PRICE_TAX} ; {$BEST_TAXED_PRICE} € TTC)</p>

    {ifloop rel="acc"}
    <h4>Accessories</h4>
    <ul>
        {loop name="acc" type="accessory" product="$ID" order="accessory"}
        <li><a href="{$URL}">{$REF}</a></li>
        {/loop}
    </ul>
    {/ifloop}
    {elseloop rel="acc"}
    <h4>No accessory</h4>
    {/elseloop}

    {ifloop rel="prod_ass_cont"}
    <h4>Associated Content</h4>
    <ul>
        {loop name="prod_ass_cont" type="associated_content" product="$ID" order="associated_content"}
        <li>{$TITLE}</li>
        {/loop}
    </ul>
    {/ifloop}
    {elseloop rel="prod_ass_cont"}
    <h4>No associated content</h4>
    {/elseloop}

    {ifloop rel="ft"}
    <h4>Features</h4>
    <ul>
        {assign var=current_product value=$ID}
        {loop name="ft" type="feature" order="manual" product="$ID"}
        <li>
            <strong>{$TITLE}</strong> :
            {loop name="ft_v" type="feature_value" product="{$current_product}" feature="$ID"}
            {$TITLE} / {$PERSONAL_VALUE}
            {/loop}
        </li>
        {/loop}
    </ul>
    {/ifloop}
    {elseloop rel="ft"}
    <h4>No feature</h4>
    {/elseloop}

    <h4>Product sale elements</h4>

    {assign var=current_product value=$ID}
    {loop name="pse" type="product_sale_elements" product="$ID"}
    <div style="border: solid 2px darkorange; padding: 5px; margin: 5px;">
        {loop name="combi" type="attribute_combination" product_sale_elements="$ID"}
        {$ATTRIBUTE_TITLE} = {$ATTRIBUTE_AVAILABILITY_TITLE}<br />
        {/loop}
        <br />{$WEIGHT} g
        <br /><strong>{if $IS_PROMO == 1} {$PROMO_PRICE} € HT // TAX : {$PROMO_PRICE_TAX} ; {$TAXED_PROMO_PRICE} € TTC (instead of {$PRICE HT} // TAX : {$PRICE_TAX} ; {$TAXED_PRICE} € TTC){else} {$PRICE} € HT // TAX : {$PRICE_TAX} ; {$TAXED_PRICE} € TTC{/if}</strong>
        <br /><br />
        Add
        <select>
            {for $will=1 to $QUANTITY}
            <option>{$will}</option>
            {/for}
        </select>
        to my cart
        </ul>
    </div>
    {/loop}

</div>

{/loop}

{/ifloop}

{elseloop rel="product"}
    <h2>Produit introuvable !</h2>
{/elseloop}