diff --git a/src/Reader.php b/src/Reader.php
index a2c00a31..58344e2a 100644
--- a/src/Reader.php
+++ b/src/Reader.php
@@ -19,12 +19,8 @@
 use JsonSerializable;
 use SplFileObject;
 
-use function array_combine;
 use function array_filter;
-use function array_pad;
-use function array_slice;
 use function array_unique;
-use function count;
 use function is_array;
 use function iterator_count;
 use function mb_strlen;
@@ -325,18 +321,16 @@ public function sorted(Closure $orderBy): TabularDataReader
     }
 
     /**
-     * @param array<string> $header
+     * @param array<string> $headerMapper
      *
      * @throws Exception
      *
      * @return Iterator<array<string|null>>
      */
-    public function getRecords(array $header = []): Iterator
+    public function getRecords(array $headerMapper = []): Iterator
     {
-        $header = $this->computeHeader($header);
-
+        $headerMapper = $this->computeHeader($headerMapper);
         $normalized = fn ($record): bool => is_array($record) && ($this->is_empty_records_included || $record !== [null]);
-
         $bom = '';
         if (!$this->is_input_bom_included) {
             $bom = $this->getInputBOM();
@@ -348,13 +342,10 @@ public function getRecords(array $header = []): Iterator
         }
 
         if ($this->is_empty_records_included) {
-            $records = new MapIterator(
-                $records,
-                fn (array $record): array => ([null] === $record) ? [] : $record
-            );
+            $records = new MapIterator($records, fn (array $record): array => ([null] === $record) ? [] : $record);
         }
 
-        return $this->combineHeader($records, $header);
+        return $this->combineHeader($records, $headerMapper);
     }
 
     /**
@@ -382,9 +373,9 @@ protected function computeHeader(array $header): array
     /**
      * Combines the CSV header to each record if present.
      *
-     * @param array<string> $header
+     * @param array<string> $headerMapper
      */
-    protected function combineHeader(Iterator $iterator, array $header): Iterator
+    protected function combineHeader(Iterator $iterator, array $headerMapper): Iterator
     {
         $formatter = fn (array $record): array => array_reduce(
             $this->formatters,
@@ -392,23 +383,17 @@ protected function combineHeader(Iterator $iterator, array $header): Iterator
             $record
         );
 
-        if ([] === $header) {
-            return new MapIterator($iterator, $formatter(...));
-        }
-
-        $field_count = count($header);
-        $mapper = function (array $record) use ($header, $field_count, $formatter): array {
-            if (count($record) !== $field_count) {
-                $record = array_slice(array_pad($record, $field_count, null), 0, $field_count);
-            }
+        return match ([]) {
+            $headerMapper => new MapIterator($iterator, $formatter(...)),
+            default => new MapIterator($iterator, function (array $record) use ($headerMapper, $formatter): array {
+                $assocRecord = [];
+                foreach ($headerMapper as $offset => $headerName) {
+                    $assocRecord[$headerName] = $record[$offset] ?? null;
+                }
 
-            /** @var array<string|null> $assocRecord */
-            $assocRecord = array_combine($header, $record);
-
-            return $formatter($assocRecord);
+                return $formatter($assocRecord);
+            }),
         };
-
-        return new MapIterator($iterator, $mapper);
     }
 
     /**
diff --git a/src/ReaderTest.php b/src/ReaderTest.php
index a4a76394..22a3b4e1 100644
--- a/src/ReaderTest.php
+++ b/src/ReaderTest.php
@@ -646,4 +646,17 @@ public function testReaderFormatterUsesOffset(): void
             ],
         ], [...$reader]);
     }
+
+    public function testHeaderMapper(): void
+    {
+        $csv = <<<CSV
+Abel,14,M,2004
+Abiga,6,F,2004
+Aboubacar,8,M,2004
+Aboubakar,6,M,2004
+CSV;
+        $firstRow = [...Reader::createFromString($csv)
+            ->getRecords([3 => 'Year', 0 => 'Firstname', 1 => 'Count'])][0];
+        self::assertSame(['Year' => '2004', 'Firstname' => 'Abel', 'Count' => '14'], $firstRow);
+    }
 }
diff --git a/src/ResultSet.php b/src/ResultSet.php
index 0c4a9e40..713efc99 100644
--- a/src/ResultSet.php
+++ b/src/ResultSet.php
@@ -31,15 +31,19 @@
  */
 class ResultSet implements TabularDataReader, JsonSerializable
 {
+    /** @var array<string> */
+    protected array $header;
+
     /**
      * @param Iterator<array-key, array<array-key, string|null>> $records
      * @param array<string> $header
      *
      * @throws SyntaxError
      */
-    public function __construct(protected Iterator $records, protected array $header = [])
+    public function __construct(protected Iterator $records, array $header = [])
     {
-        $this->validateHeader($this->header);
+        $this->validateHeader($header);
+        $this->header = array_values($header);
     }
 
     /**
@@ -150,45 +154,40 @@ public function sorted(Closure $orderBy): TabularDataReader
     }
 
     /**
-     * @param array<string> $header
+     * @param array<string> $headerMapper
      *
      * @throws SyntaxError
      *
      * @return Iterator<array-key, array<array-key, string|null>>
      */
-    public function getRecords(array $header = []): Iterator
+    public function getRecords(array $headerMapper = []): Iterator
     {
-        $this->validateHeader($header);
+        $this->validateHeader($headerMapper);
 
-        yield from $this->combineHeader($header);
+        yield from $this->combineHeader($headerMapper);
     }
 
     /**
      * Combines the header to each record if present.
      *
-     * @param array<string> $header
+     * @param array<string> $headerMapper
      *
      * @return Iterator<array-key, array<array-key, string|null>>
      */
-    protected function combineHeader(array $header): Iterator
+    protected function combineHeader(array $headerMapper): Iterator
     {
-        if ($header === $this->header || [] === $header) {
-            return $this->records;
-        }
-
-        $field_count = count($header);
-        $mapper = static function (array $record) use ($header, $field_count): array {
-            if (count($record) !== $field_count) {
-                $record = array_slice(array_pad($record, $field_count, null), 0, $field_count);
-            }
-
-            /** @var array<string, string|null> $assocRecord */
-            $assocRecord = array_combine($header, $record);
-
-            return $assocRecord;
+        return match (true) {
+            $headerMapper === $this->header,
+            [] === $headerMapper => $this->records,
+            default => new MapIterator($this->records, function (array $record) use ($headerMapper): array {
+                $assocRecord = [];
+                foreach ($headerMapper as $offset => $headerName) {
+                    $assocRecord[$headerName] = $record[$offset] ?? null;
+                }
+
+                return $assocRecord;
+            }),
         };
-
-        return new MapIterator($this->records, $mapper);
     }
 
     public function count(): int
diff --git a/src/ResultSetTest.php b/src/ResultSetTest.php
index 3ef4d272..15fc5ee4 100644
--- a/src/ResultSetTest.php
+++ b/src/ResultSetTest.php
@@ -410,4 +410,17 @@ public function testExistsRecord(): void
         self::assertFalse(Statement::create()->process($this->csv)->exists(fn (array $record) => array_key_exists('foobar', $record)));
         self::assertTrue(Statement::create()->process($this->csv)->exists(fn (array $record) => count($record) < 5));
     }
+
+    public function testHeaderMapperOnResultSet(): void
+    {
+        $results = Statement::create()
+            ->process($this->csv)
+            ->getRecords([2 => 'e-mail', 1 => 'lastname', 33 => 'does not exists']);
+
+        self::assertSame([
+            'e-mail' => 'john.doe@example.com',
+            'lastname' => 'doe',
+            'does not exists' => null,
+        ], [...$results][0]);
+    }
 }
diff --git a/src/StatementTest.php b/src/StatementTest.php
index fbc23225..11adc2ea 100644
--- a/src/StatementTest.php
+++ b/src/StatementTest.php
@@ -144,4 +144,16 @@ public function testOrderByWithEquity(): void
 
         self::assertSame($this->expected, array_values([...$calculated]));
     }
+
+    public function testHeaderMapperOnStatement(): void
+    {
+        $results = Statement::create()
+            ->process($this->csv, [2 => 'e-mail', 1 => 'lastname', 33 => 'does not exists']);
+        self::assertSame(['e-mail', 'lastname', 'does not exists'], $results->getHeader());
+        self::assertSame([
+            'e-mail' => 'john.doe@example.com',
+            'lastname' => 'doe',
+            'does not exists' => null,
+        ], $results->first());
+    }
 }
diff --git a/src/TabularDataReader.php b/src/TabularDataReader.php
index c96940c9..fb2ffff5 100644
--- a/src/TabularDataReader.php
+++ b/src/TabularDataReader.php
@@ -78,11 +78,11 @@ public function getHeader(): array;
      * filled with null values while extra record fields are strip from
      * the returned object.
      *
-     * @param array<string> $header an optional header to use instead of the CSV document header
+     * @param array<string> $headerMapper an optional header mapper to use instead of the CSV document header
      *
      * @return Iterator<array-key,array<string|null>>
      */
-    public function getRecords(array $header = []): Iterator;
+    public function getRecords(array $headerMapper = []): Iterator;
 
     /**
      * Returns the next key-value pairs from the tabular data (first