{foreach from=$product.features item=feature name=features}    
   {$feature.name|escape:'htmlall':'UTF-8'}: {$feature.value|escape:'htmlall':'UTF-8'}
{/foreach}

{foreach from=$product.features item=feature name=features}    
   {$feature|@print_r}
{/foreach}

Array ( [id_feature] => 8 [id_product] => 8 [id_feature_value] => 36 ) 1 Array ( [id_feature] => 9 [id_product] => 8 [id_feature_value] => 51 )

{assign var='features' value=Product::getFrontFeaturesStatic($cookie->id_lang, $product.id_product)}
        {if isset($features) && $features}
        {foreach from=$features item=feature}
            {if isset($feature.value)}
                <li><span>{$feature.name|escape:'htmlall':'UTF-8'}</span> {$feature.value|escape:'htmlall':'UTF-8'}</li>
            {/if}
        {/foreach}
        {/if}