diff --git a/plugins/woocommerce/changelog/fix-52071-thumbnail-images-sizes b/plugins/woocommerce/changelog/fix-52071-thumbnail-images-sizes
new file mode 100644
index 00000000000..2fa9bc2bdc0
--- /dev/null
+++ b/plugins/woocommerce/changelog/fix-52071-thumbnail-images-sizes
@@ -0,0 +1,4 @@
+Significance: patch
+Type: performance
+
+Add sizes attribute to Product gallery thumbnail images to better load the appropriate resolution
diff --git a/plugins/woocommerce/client/legacy/js/flexslider/jquery.flexslider.js b/plugins/woocommerce/client/legacy/js/flexslider/jquery.flexslider.js
index 78e25432cb1..f5b805544f5 100755
--- a/plugins/woocommerce/client/legacy/js/flexslider/jquery.flexslider.js
+++ b/plugins/woocommerce/client/legacy/js/flexslider/jquery.flexslider.js
@@ -256,6 +256,7 @@
                   onload: 'this.width = this.naturalWidth; this.height = this.naturalHeight',
                   src: slide.attr('data-thumb'),
                   srcset: slide.attr('data-thumb-srcset'),
+                  sizes: slide.attr('data-thumb-sizes'),
                   alt: slide.attr('alt')
                 })
               }
diff --git a/plugins/woocommerce/includes/wc-template-functions.php b/plugins/woocommerce/includes/wc-template-functions.php
index 8cd30b3b12c..57b733b9802 100644
--- a/plugins/woocommerce/includes/wc-template-functions.php
+++ b/plugins/woocommerce/includes/wc-template-functions.php
@@ -1659,6 +1659,7 @@ function wc_get_gallery_image_html( $attachment_id, $main_image = false ) {
 	$full_size         = apply_filters( 'woocommerce_gallery_full_size', apply_filters( 'woocommerce_product_thumbnails_large_size', 'full' ) );
 	$thumbnail_src     = wp_get_attachment_image_src( $attachment_id, $thumbnail_size );
 	$thumbnail_srcset  = wp_get_attachment_image_srcset( $attachment_id, $thumbnail_size );
+	$thumbnail_sizes   = wp_get_attachment_image_sizes( $attachment_id, $thumbnail_size );
 	$full_src          = wp_get_attachment_image_src( $attachment_id, $full_size );
 	$alt_text          = trim( wp_strip_all_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) );
 
@@ -1696,7 +1697,7 @@ function wc_get_gallery_image_html( $attachment_id, $main_image = false ) {
 		$image_params
 	);
 
-	return '<div data-thumb="' . esc_url( $thumbnail_src[0] ) . '" data-thumb-alt="' . esc_attr( $alt_text ) . '" data-thumb-srcset="' . esc_attr( $thumbnail_srcset ) . '" class="woocommerce-product-gallery__image"><a href="' . esc_url( $full_src[0] ) . '">' . $image . '</a></div>';
+	return '<div data-thumb="' . esc_url( $thumbnail_src[0] ) . '" data-thumb-alt="' . esc_attr( $alt_text ) . '" data-thumb-srcset="' . esc_attr( $thumbnail_srcset ) . '"  data-thumb-sizes="' . esc_attr( $thumbnail_sizes ) . '" class="woocommerce-product-gallery__image"><a href="' . esc_url( $full_src[0] ) . '">' . $image . '</a></div>';
 }
 
 if ( ! function_exists( 'woocommerce_output_product_data_tabs' ) ) {