Armor and Weapon Upgrade Kits don't negatively effect durability.
Armor Flexibility Kits reduce the Stamina Climbing Cost by 5% per tier. (Up from 2%)
Armor Reduction Kits renamed to Armor Weight Reduction Kits and reduce weight with 50% (Up from 40%)
Armor Plating increase armor by 10 per tier. (Up from 1)
Pairing Blade reduce weapons weight by 50%.
Weapon Damage Kit increase weapon damage by 2 per tier (Up from 1)
Reinforcement Kits increase durability with 100 per tier (Up from 50)
Spiked Weapon Fitting increase armor penatration with 20% (Up from 15%)