to make you an example, whit all ice arm we should get 105percent ice dif, but we only get 70percent.and his is realy unfair...bcoz if you putted this arm restriction,why you not solve this one? All arm give less dif that they realy should and we are realy wandering why dear gm...
For example, if you have helmet with 20% ice protection and shield with 10% protection, your total ice resistance is not 30%. If monster deals you 100 damage, helmet will take 20% of it (100*20%=20), and shield will take 10% of 80 damage left (80*10%=8), so in total your ice protection will be 28%, not 30.