GAL 9999

Shield

This protective skill reduces damage from the enemy attacks.
 
Percents Shields:
Reduce the incoming damage by subtracting the indicated percentage against a certain damage or effect ( shield Fire , Ice Shield , Laser Shield ... Fork Shield , Splash Shield, Shield Trample ... )

The use of two of more Shield percents of the same type, will multiply the protection, not add.
If a mech has 2 shields which each block 50% of laser damage, that mech isn't immune to lasers:
The first shield will block 50% of the damage, then the second shield will block 50% of the remaining damage, for a total of 75% damage blocked.
 
Direct Shields:
Reduce any damage subtracting the indicated amount in brackets to the damage dealt.
 
Tips:
1. Laser, cannons and Missiles are the more frecuent weapons, so if you want to equip shields in your Mechs, those options are the most common.
 
2. A good idea is to check in your hangar the weakness of your mech, and equip then the shields that may reduce or counter them. 
 
3. Obviously, the elite shields are the most effective. Providing not only a higher percentile shield, but also with less weakness and adding some direct shielding too.
 
Notes:
Although some mech factory include this option in your build , you usually protect mechs equipping them with shields in the appropriate slot as soon as possible.