I think the Extra Padding passive does nothing : r/Helldivers

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Advanced Combat Tips and Tricks - Helldivers 2 Guide - IGN

Helldivers

Helldivers

All Body Armor So Far on Helldivers 2

Extra padding should be more effective for heavier armours and less effective for lighter armours : r/Helldivers

Helldivers 2: Extra Padding passive explained - Dot Esports

Helldivers 2 best loadouts: Weapons, armour, and Stratagems

Helldivers 2: The Best Armour For Spreading Managed Democracy

Best Starting Tips & Tricks – Helldivers 2 - Tips & Tricks - Getting Started, Helldivers 2

Best Armor in Helldivers 2 Explained - Prima Games