With Tackle Slip there's a 20% chance of becoming disoriented after avoiding a tackle. With Tackle Slip 2 there's a 40% chance. If there is another tackle made in the same encounter as the one in which the player was disoriented, the tech placed in the first tech slot will be unequipped. You can re-equip it at half time or the beginning of the next match. Only that one tech will be unequipped, you cannot lose any more in a single match.