The Leopard 2A4M and 2A6M add an additional mine protection plate for the belly, which increases protection against mines and improvised explosive devices [REF].
According to a description page hosted by the Federation of American Scientists, the armour of the Leopard 2A4 is believed to provide protection equivalent to 700 mm armour steel (RHA) against kinetic energy penetrators and 1000 mm RHA against shaped charge warheads [REF].