The 'Manmax' Waistcoat is a Body Armor added in The Big Map Quest Update.
The 'Manmax' Waistcoat provides 7% Agility, and reduces the damage of the first shot taken by 30%, and takes 5 seconds to recharge.
There is a shield icon that appears above the player's head that has the number "30" on it. The shield becomes cracked when the player is shot, and disappears before appearing again when the cooldown is finished.
Note: The shield icon appears above the player's head even under the effects of Stealth, so it is not recommended to use Stealth with the 'Manmax' Waistcoat.