diff --git a/behaviors/combos.dtsi b/behaviors/combos.dtsi
index 9b095c8..e9d8fd0 100644
--- a/behaviors/combos.dtsi
+++ b/behaviors/combos.dtsi
@@ -11,6 +11,8 @@
 
 // NOTE: Other mouse keys related combos in ./mouse.dtsi
 
+// NOTE: Soft off combos in ./soft-off.dtsi
+
 /***********************
   BASE LAYER
 ***********************/
diff --git a/behaviors/soft-off.dtsi b/behaviors/soft-off.dtsi
new file mode 100644
index 0000000..a79abea
--- /dev/null
+++ b/behaviors/soft-off.dtsi
@@ -0,0 +1,10 @@
+// NOTE: Only turn off it the key is held for N ms or longer
+&soft_off {
+    hold-time-ms = <3000>;
+};
+
+// Soft off left half, active on navigation layer
+ZMK_COMBO(off_left, &soft_off, LT3 LT4, NAV)
+
+// Soft off right half, active on symbols layer
+ZMK_COMBO(off_right, &soft_off, RT3 RT4, SYM)
diff --git a/config/corne.conf b/config/corne.conf
index 587cf82..8099ff3 100644
--- a/config/corne.conf
+++ b/config/corne.conf
@@ -14,6 +14,10 @@ CONFIG_ZMK_SLEEP=y
 # 1.800.000 ms = 30 minutes
 CONFIG_ZMK_IDLE_SLEEP_TIMEOUT=1800000
 
+# enable soft off behavior
+# https://zmk.dev/docs/config/power#soft-off
+CONFIG_ZMK_PM_SOFT_OFF=y
+
 # Add mouse keys support
 CONFIG_ZMK_MOUSE=y
 
diff --git a/config/urchin.conf b/config/urchin.conf
index 38afd6d..60043d8 100644
--- a/config/urchin.conf
+++ b/config/urchin.conf
@@ -12,6 +12,10 @@ CONFIG_ZMK_SLEEP=y
 # 1.800.000 ms = 30 minutes
 CONFIG_ZMK_IDLE_SLEEP_TIMEOUT=1800000
 
+# enable soft off behavior
+# https://zmk.dev/docs/config/power#soft-off
+CONFIG_ZMK_PM_SOFT_OFF=y
+
 # "Eager Debouncing"
 # Trying to lower the input lag.
 # CONFIG_ZMK_KSCAN_DEBOUNCE_PRESS_MS=1