Repeating Command Block: execute @a[hasitem={item=leather_boots,location=slot.armor.feet}] ~~~ detect ~~-1~ air 0 execute @s ~~~ detect ~~-2~ air 0 execute @s ~~~ detect ~~-3~ air 0 execute @s ~~~ detect ~~-4~ air 0 gamerule falldamage false Impulse Command Block: gamerule falldamage true