diff --git a/src/AttributeDataSet.php b/src/AttributeDataSet.php
index 4884a0d..09a3835 100644
--- a/src/AttributeDataSet.php
+++ b/src/AttributeDataSet.php
@@ -1,7 +1,7 @@
 <?php
 namespace SnowIO\FredhopperDataModel;
 
-final class AttributeDataSet
+final class AttributeDataSet implements \IteratorAggregate
 {
     use SetTrait;
 
diff --git a/src/CategoryDataSet.php b/src/CategoryDataSet.php
index cd8e383..29bcc36 100644
--- a/src/CategoryDataSet.php
+++ b/src/CategoryDataSet.php
@@ -1,7 +1,7 @@
 <?php
 namespace SnowIO\FredhopperDataModel;
 
-final class CategoryDataSet
+final class CategoryDataSet implements \IteratorAggregate
 {
     use SetTrait;
 
diff --git a/src/CategoryIdSet.php b/src/CategoryIdSet.php
index 2b713a8..fa17236 100644
--- a/src/CategoryIdSet.php
+++ b/src/CategoryIdSet.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace SnowIO\FredhopperDataModel;
 
-final class CategoryIdSet
+final class CategoryIdSet implements \IteratorAggregate
 {
     use SetTrait {
         overlaps as private;
diff --git a/src/ProductDataSet.php b/src/ProductDataSet.php
index 1361081..ea73068 100644
--- a/src/ProductDataSet.php
+++ b/src/ProductDataSet.php
@@ -1,7 +1,7 @@
 <?php
 namespace SnowIO\FredhopperDataModel;
 
-final class ProductDataSet
+final class ProductDataSet implements \IteratorAggregate
 {
     use SetTrait;
 
diff --git a/src/VariantDataSet.php b/src/VariantDataSet.php
index ada819d..463819e 100644
--- a/src/VariantDataSet.php
+++ b/src/VariantDataSet.php
@@ -1,7 +1,7 @@
 <?php
 namespace SnowIO\FredhopperDataModel;
 
-final class VariantDataSet
+final class VariantDataSet implements \IteratorAggregate
 {
     use SetTrait;