
New perk Offence And Defense : You gain +5% DR when you wear medium armor, and +5% critical hit chance when you use small guns (pistols, rifles, submachine guns, shotguns, energy pistols and energy rifles). Similarly, Heavy Weight only works with heavy armor. Pack Rat is medium armor's perk now and only take effect when wearing full set of medium/armor(armor and helmet). Light Touch now don't check armor type and take effect when inventory weight is less than 160(Contrary to Hoarder, and with Project Nevada it's 0.75 of your max Carry Weight). Besides, Power Armor Training will give all power armor(except NCR Salvaged Power Armor, which has a higher initial Set Bonus) +10% DR and +(half of the armor set weight) Carry Weight. Power armor don't need Power Armor Training any more.
Medium/Heavy armor's bonus is higher than that of light armor. Now when you wear a full set of armor(armor and helmet,e.g Riot Gear and Riot Gear Helmet) you gain an additional Damage Resistance(Fire Resistance/Posion Resistance/Rad Resistance/other property) bonus.