diff --git a/include/x11/tray_manager.hpp b/include/x11/tray_manager.hpp
index 5469af86..24197203 100644
--- a/include/x11/tray_manager.hpp
+++ b/include/x11/tray_manager.hpp
@@ -12,6 +12,7 @@
 #include "events/signal_fwd.hpp"
 #include "events/signal_receiver.hpp"
 #include "utils/concurrency.hpp"
+#include "utils/mixins.hpp"
 #include "x11/atoms.hpp"
 #include "x11/connection.hpp"
 #include "x11/tray_client.hpp"
@@ -45,7 +46,19 @@ struct tray_settings {
    * Number of pixels added between tray icons
    */
   unsigned spacing{0U};
+
+  /**
+   * Background color used in the client wrapper window
+   *
+   * If transparent, pseudo-transparency is used for the icon.
+   */
   rgba background{};
+
+  /**
+   * Used for `_NET_SYSTEM_TRAY_COLORS` atom
+   *
+   * Is only a hint to the tray applications.
+   */
   rgba foreground{};
 
   /**
@@ -62,7 +75,9 @@ class manager : public xpp::event::sink<evt::expose, evt::client_message, evt::c
                     evt::selection_clear, evt::property_notify, evt::reparent_notify, evt::destroy_notify,
                     evt::map_notify, evt::unmap_notify>,
                 public signal_receiver<SIGN_PRIORITY_TRAY, signals::ui::update_background,
-                    signals::ui_tray::tray_pos_change, signals::ui_tray::tray_visibility> {
+                    signals::ui_tray::tray_pos_change, signals::ui_tray::tray_visibility>,
+                non_copyable_mixin,
+                non_movable_mixin {
  public:
   explicit manager(connection& conn, signal_emitter& emitter, const logger& logger, const bar_settings& bar_opts,
       on_update on_update);
diff --git a/src/x11/tray_manager.cpp b/src/x11/tray_manager.cpp
index 9774b501..2c884d52 100644
--- a/src/x11/tray_manager.cpp
+++ b/src/x11/tray_manager.cpp
@@ -50,15 +50,17 @@ manager::~manager() {
 }
 
 void manager::setup(const config& conf, const string& section_name) {
-  unsigned client_height = m_bar_opts.inner_area().height;
+  unsigned bar_height = m_bar_opts.inner_area().height;
 
   // Add user-defined padding
   m_opts.spacing = conf.get<unsigned>(section_name, "tray-padding", 0);
 
-  auto maxsize = conf.get<unsigned>(section_name, "tray-maxsize", 16);
-  if (client_height > maxsize) {
-    m_opts.spacing += (client_height - maxsize) / 2;
-    client_height = maxsize;
+  auto size = conf.get(section_name, "tray-size", percentage_with_offset{66., ZERO_PX_EXTENT});
+  unsigned client_height = std::min(
+      bar_height, units_utils::percentage_with_offset_to_pixel_nonnegative(size, bar_height, m_bar_opts.dpi_y));
+
+  if (client_height == 0) {
+    m_log.warn("tray: tray-size has an effective value of 0px, you will not see any tray icons");
   }
 
   m_opts.client_size = {client_height, client_height};
@@ -293,7 +295,7 @@ void manager::query_atom() {
 }
 
 /**
- * Set color atom used by clients when determing icon theme
+ * Set _NET_SYSTEM_TRAY_COLORS atom used by clients when determing icon theme
  */
 void manager::set_tray_colors() {
   m_log.trace("tray: Set _NET_SYSTEM_TRAY_COLORS to 0x%08x", m_opts.foreground);