diff --git a/doc/3. Customization/Filters.md b/doc/3. Customization/Filters.md
index 8ca2c12..caee29c 100644
--- a/doc/3. Customization/Filters.md	
+++ b/doc/3. Customization/Filters.md	
@@ -59,3 +59,5 @@ There are list of available filters:
 * *RetailcrmFilterSaveCorporateCustomerAddress* - built corporate customer address object, which will be saved to CMS
 
 * *RetailcrmFilterJobManagerIntervals* - array with jobs as keys and intervals as values
+* *RetailcrmFilterWeight* - array with weight units in ICML
+* *RetailcrmFilterMiddlewares* - array with middlewares, which running before and after request
diff --git a/retailcrm/lib/RetailcrmCatalog.php b/retailcrm/lib/RetailcrmCatalog.php
index 2c8a956..b9b1914 100644
--- a/retailcrm/lib/RetailcrmCatalog.php
+++ b/retailcrm/lib/RetailcrmCatalog.php
@@ -191,10 +191,7 @@ class RetailcrmCatalog
                         $article = null;
                     }
 
-                    $weight = round($product['weight'], 2);
-                    if (0.0 === $weight) {
-                        $weight = null;
-                    }
+                    $weight = $this->getWeightInKg($product['weight']);
 
                     $width = round($product['width'], 3);
                     $height = round($product['height'], 3);
@@ -366,10 +363,8 @@ class RetailcrmCatalog
         return $pictures;
     }
 
-    private static function getProductsCount(
-        $id_lang,
-        Context $context = null
-    ) {
+    private static function getProductsCount($id_lang, Context $context = null)
+    {
         if (!$context) {
             $context = Context::getContext();
         }
@@ -450,4 +445,71 @@ class RetailcrmCatalog
 
         return $parentId;
     }
+
+    private function getWeightInKg($weight)
+    {
+        if (0 == $weight) {
+            return null;
+        }
+
+        $mg = 1 / 1000 / 1000;
+        $g = 1 / 1000;
+        $ton = 1 * 1000;
+        $oz = 1 / 35.3;
+        $pd = 1 * 2.2;
+        $st = 1 * 6.35;
+
+        $weightUnits = [
+            'mg' => $mg,
+            'мг' => $mg,
+            'miligramo' => $mg,
+            'миллиграмм' => $mg,
+            'milligram' => $mg,
+
+            'g' => $g,
+            'gram' => $g,
+            'grammo' => $g,
+            'г' => $g,
+            'гр' => $g,
+            'грамм' => $g,
+
+            'kg' => 1,
+            'kilogram' => 1,
+            'kilogramme' => 1,
+            'kilo' => 1,
+            'kilogramo' => 1,
+
+            'ton' => $ton,
+            'т' => $ton,
+            'тонна' => $ton,
+            'tonelada' => $ton,
+            'toneladas' => $ton,
+
+            'oz' => $oz,
+            'унция' => $oz,
+            'ounce' => $oz,
+            'onza' => $oz,
+
+            'pd' => $pd,
+            'фунт' => $pd,
+            'pound' => $pd,
+            'lb' => $pd,
+            'libra' => $pd,
+            'paladio' => $pd,
+
+            'st' => $st,
+            'стоун' => $st,
+            'stone' => $st,
+        ];
+
+        $weightUnits = RetailcrmTools::filter('RetailcrmFilterWeight', $weightUnits);
+
+        $weightUnit = Configuration::get('PS_WEIGHT_UNIT');
+
+        if (isset($weightUnits[$weightUnit])) {
+            return $weight * $weightUnits[$weightUnit];
+        }
+
+        return $weight;
+    }
 }
diff --git a/retailcrm/lib/RetailcrmIcml.php b/retailcrm/lib/RetailcrmIcml.php
index b5ff660..79761ce 100644
--- a/retailcrm/lib/RetailcrmIcml.php
+++ b/retailcrm/lib/RetailcrmIcml.php
@@ -62,12 +62,12 @@ class RetailcrmIcml
             'productActivity',
             'dimensions',
             'vatRate',
+            'weight',
         ];
 
         $this->params = [
             'article' => 'Артикул',
             'color' => 'Цвет',
-            'weight' => 'Вес',
             'tax' => 'Наценка',
         ];
     }