diff --git a/dev/js/main/header/header.js b/dev/js/main/header/header.js
index 2ad30b1..13243fb 100644
--- a/dev/js/main/header/header.js
+++ b/dev/js/main/header/header.js
@@ -12,18 +12,41 @@ jQuery(function($) {
     var $mainNavigation = $('.js__main-navigation');
     var $openSubMenuLink = $('.js__main-navigation__open-sub-menu-link');
     var $mainNavigationItemsList = $mainNavigation.find('.js__main-navigation__items-list').children('li');
-
-    //var $mainNavigationItemsListSub = ('.main-navigation__item._sub');
+    var $secondNavLevel = $('.second-navigation-level');
+    var $thirdNavLevel = $('.third-navigation-level');
+    var $openThirdMenuLink = $('.js__main-navigation__open-third-menu-link');
     var $dropdownMenuWithColumns = $('.js__dropdown-menu-with-columns .js__main-navigation__item._sub');
+
     if (!touchSupport) {
         $dropdownMenuWithColumns.hover(function() {
             $(this).toggleClass('open');
         });
     }
 
+    // Set class for third-navigation-level to handle position on left or right
+    var setThirdMenuPosition = function() {
+        if ($thirdNavLevel.length) {
+            if (window.matchMedia('(min-width: 992px)').matches) {
+                $secondNavLevel.each(function() {
+                    var offsetRight = $(window).width() - $(this).offset().left - $(this).outerWidth();
+                    var secondNavLevelWidth = $(this).width();
+                    var thirdNavLevelWidth = $(this).find($thirdNavLevel).width();
+                    if (offsetRight < thirdNavLevelWidth) {
+                        $(this).find($thirdNavLevel).css('left', -secondNavLevelWidth);
+                    } else {
+                        $(this).find($thirdNavLevel).css('left', secondNavLevelWidth);
+                    }
+                });
+            } else {
+                $thirdNavLevel.css('left', 'auto');
+            }
+        }
+    };
+    // Initial call for function
+    setThirdMenuPosition();
     // Cleanup function to clean unneeded classes
     var cleanup = function() {
-        $mainNavigationItemsList.removeClass('_open-mobile-dropdown _open-tablet-dropdown');
+        $mainNavigation.find('.js__main-navigation__items-list').find('li').removeClass('_open-mobile-dropdown _open-tablet-dropdown');
         $html.removeClass('mobile-menu-opened');
 
         if (window.matchMedia('(min-width: 992px)').matches) {
@@ -31,12 +54,16 @@ jQuery(function($) {
         } else {
             $('.js__navigation__items-wrp').hide();
         }
+
+        //Set timeout for third menu position to load the width
+        window.setTimeout(function() {
+            setThirdMenuPosition();
+        }, 500);
     };
 
     // Add click event to dropdown link on mobile devices.
     $openSubMenuLink.on('click', function(e) {
         e.preventDefault();
-
         if (window.matchMedia('(min-width: 992px)').matches) {
             $mainNavigationItemsList.not($(this).parents()).removeClass('_open-tablet-dropdown');
             $(this).parents('.main-navigation__item').toggleClass('_open-tablet-dropdown');
@@ -45,8 +72,16 @@ jQuery(function($) {
         }
     });
 
-    // detect if we cross 992px window width.
-    window.matchMedia('(min-width: 992px)').addListener(cleanup);
+    // Add click event to second menu dropdown link on mobile devices.
+    $openThirdMenuLink.on('click', function(e) {
+        e.preventDefault();
+        if (window.matchMedia('(min-width: 992px)').matches) {
+            $('.main-navigation__sub-item').not($(this).parents('.main-navigation__sub-item')).removeClass('_open-tablet-dropdown');
+            $(this).parents('.main-navigation__sub-item').toggleClass('_open-tablet-dropdown');
+        } else {
+            $(this).parents('.main-navigation__sub-item').toggleClass('_open-mobile-dropdown');
+        }
+    });
 
     var mobileMenuAnimationComplete = true;
     $('.js__main-navigation__toggle-btn').on('click', function(e) {
@@ -60,6 +95,8 @@ jQuery(function($) {
         });
     });
 
+    // detect if we cross 992px window width.
+    window.matchMedia('(min-width: 992px)').addListener(cleanup);
 });
 
 // ====== class fo fixed main navigation bar   =======
diff --git a/dev/styles/main/header/header.less b/dev/styles/main/header/header.less
index 133bd44..fc506c4 100644
--- a/dev/styles/main/header/header.less
+++ b/dev/styles/main/header/header.less
@@ -546,18 +546,23 @@
     transform: rotate(90deg);
 }
 
-._open-mobile-dropdown .main-navigation__open-sub-menu-link:before {
+._open-mobile-dropdown > .main-navigation__open-sub-menu-link:before {
 
     -webkit-transform: rotate(45deg);
     transform: rotate(45deg);
 }
 
-._open-mobile-dropdown .main-navigation__open-sub-menu-link:after {
+._open-mobile-dropdown > .main-navigation__open-sub-menu-link:after {
     -webkit-transform: rotate(135deg);
     transform: rotate(135deg);
 
 }
 
+// Open link cross for third navigation level, adjust height
+.main-navigation__sub-item > .main-navigation__open-sub-menu-link {
+    line-height: 40px;
+}
+
 .main-navigation__sub-item-list {
     list-style: none;
     padding: 0;
@@ -577,16 +582,22 @@
 }
 
 @media (max-width: 991px) {
-    ._open-mobile-dropdown .main-navigation__sub-item-list {
+    ._open-mobile-dropdown > .main-navigation__sub-item-list {
         -webkit-transform: scale(1, 1);
         transform: scale(1,1);
         opacity: 1;
         visibility: visible;
         max-height: 100%;
     }
+
+    //Set border-top for links on second navigation level if third navigation level is enabled
+    .second-navigation-level ._sub > .main-navigation__sub-item-link {
+        border-top: 1px solid @header-border-color;
+    }
 }
 
 .main-navigation__sub-item {
+    position: relative;
 }
 
 .main-navigation__sub-item-link {
@@ -611,6 +622,11 @@
     color: @nav-link-active-hover-color;
 }
 
+// More padding for third level links
+.third-navigation-level .main-navigation__sub-item-link {
+    padding-left: 90px;
+}
+
 
 @media (min-width: 992px) {
     .main-navigation {
@@ -665,6 +681,7 @@
         display: none;
     }
 
+    //Second navigation level
     .main-navigation__sub-item-list {
         position: absolute;
         -webkit-transform: translate3d(0, 16px, 0);
@@ -684,31 +701,51 @@
         right: 0;
     }
 
-    .main-navigation__sub-item-link {
+    .main-navigation__sub-item-link,
+    .third-navigation-level .main-navigation__sub-item-link {
         padding-left: 20px;
     }
+    //Third navigation level
+    .main-navigation__sub-item-list.third-navigation-level {
+        top: -3px;
+    }
 }
 
 
 @media (min-width: 992px) {
 
     // Submenu by hover (devices without touch screen)
-    .no-touch .main-navigation__item._sub:hover .main-navigation__sub-item-list{
+    .no-touch .main-navigation__sub-item._sub:hover > .main-navigation__sub-item-list,
+    .no-touch .main-navigation__item._sub:hover > .main-navigation__sub-item-list{
         visibility: visible;
         opacity: 1;
         -webkit-transform: translate3d(0, 0, 0);
         transform: translate3d(0, 0, 0);
     }
-    .no-touch ._sub .main-navigation__item-link:after{
+
+    // Dropdown arrow
+    .no-touch ._sub > .main-navigation__item-link:after {
         .icons();
         // content: "\e10f";
-        padding-left: 5px;
+        padding-left: 3px;
         position: relative;
         font-size: 15px;
-        top: 0;
+        top: 2px;
         color: @nav-link-arrow-color;
     }
 
+    // Third menu arrow right
+    .no-touch ._sub > .main-navigation__sub-item-link:after {
+        .icons();
+        content: "\e675";
+        padding-left: 3px;
+        position: relative;
+        font-size: 15px;
+        top: 6px;
+        color: @nav-link-arrow-color;
+        float: right;
+    }
+
     // Submenu by click (Tablet)
     .touch .main-navigation__item._sub .main-navigation__item-link {
         display: block;
@@ -724,7 +761,8 @@
         border: none;
     }
 
-    .touch .main-navigation__item._sub._open-tablet-dropdown .main-navigation__sub-item-list{
+    .touch .main-navigation__sub-item._sub._open-tablet-dropdown > .main-navigation__sub-item-list,
+    .touch .main-navigation__item._sub._open-tablet-dropdown > .main-navigation__sub-item-list{
         visibility: visible;
         opacity: 1;
         -webkit-transform: translate3d(0, 0, 0);
@@ -752,7 +790,16 @@
         height: auto;
     }
 
-    .touch .main-navigation__item._sub._open-tablet-dropdown .main-navigation__open-sub-menu-link:before {
+    .touch .second-navigation-level ._sub > .main-navigation__open-sub-menu-link:before {
+        line-height: 46px;
+    }
+
+    .touch .main-navigation__item._sub._open-tablet-dropdown > .main-navigation__open-sub-menu-link:before {
+        -webkit-transform: rotate(135deg);
+        transform: rotate(135deg);
+    }
+
+    .touch .second-navigation-level ._sub._open-tablet-dropdown > .main-navigation__open-sub-menu-link:before {
         -webkit-transform: rotate(135deg);
         transform: rotate(135deg);
     }
diff --git a/dev/templates/layouts/default.hbs b/dev/templates/layouts/default.hbs
index 6b9713f..c3bfd11 100644
--- a/dev/templates/layouts/default.hbs
+++ b/dev/templates/layouts/default.hbs
@@ -21,6 +21,7 @@
 
         showMainNavSearch="false"
         navDropdown="true"
+        navThirdLevel="false"
     }}
 
     <!-- pages -->
diff --git a/dev/templates/parts/nav/nav.hbs b/dev/templates/parts/nav/nav.hbs
index 50b81a5..1bf2555 100644
--- a/dev/templates/parts/nav/nav.hbs
+++ b/dev/templates/parts/nav/nav.hbs
@@ -43,12 +43,12 @@
                         {{~/is~}}
                         <a href="{{basename}}.html" class="main-navigation__open-sub-menu-link js__main-navigation__open-sub-menu-link">Open</a>
 
-                        <ul class="main-navigation__sub-item-list">
+                        <ul class="main-navigation__sub-item-list {{#is ../../this.navThirdLevel 'true' }} second-navigation-level {{/is}} ">
 
                             {{!build sub menu level 2}}
                             {{!grunt/helpers/helper-submenu.js}}
                             {{~#subMenu ../../pages 2~}}
-                                <li class="main-navigation__sub-item {{#if this.isCurrentPage}} _active{{/if}}
+                                <li class="main-navigation__sub-item {{#if this.isCurrentPage}} _active{{/if}} {{#is ../../../this.navThirdLevel 'true' }}_sub {{/is}}
                                 {{!add "active" class if some of children also active}}
                                 {{! grunt/helpers/helper-ifChildrensActive_addClass.js}}
                                 {{~#ifChildrensActive_addClass ../../../pages ~}}
@@ -59,6 +59,30 @@
                                     {{~else~}}
                                         <a class="main-navigation__sub-item-link" href="{{data.externalLink}}">{{data.title}}</a>
                                     {{~/is~}}
+
+                                    {{!@TODO need some more conditions here to check for subpages}}
+                                    {{#is ../../../this.navThirdLevel 'true' }}
+                                        <a href="{{basename}}.html" class="main-navigation__open-sub-menu-link js__main-navigation__open-third-menu-link">Open</a>
+
+                                        <ul class="main-navigation__sub-item-list third-navigation-level">
+                                            {{!build sub menu level 3}}
+                                            {{!grunt/helpers/helper-submenu.js}}
+                                            {{~#subMenu ../../../../pages 3~}}
+                                                <li class="main-navigation__sub-item {{#if this.isCurrentPage}} _active{{/if}}
+                                                    {{!add "active" class if some of children also active}}
+                                                    {{! grunt/helpers/helper-ifChildrensActive_addClass.js}}
+                                                    {{~#ifChildrensActive_addClass ../../../../../pages ~}}
+                                                            _active
+                                                        {{~/ifChildrensActive_addClass~}}">
+                                                    {{~#is data.externalLink false~}}
+                                                        <a class="main-navigation__sub-item-link" href="{{basename}}.html">{{data.title}}</a>
+                                                        {{~else~}}
+                                                        <a class="main-navigation__sub-item-link" href="{{data.externalLink}}">{{data.title}}</a>
+                                                    {{~/is~}}
+                                                </li>
+                                            {{~/subMenu~}}
+                                        </ul>
+                                    {{~/is~}}
                                 </li>
                             {{~/subMenu~}}