Mineraft Tip #1 Armor durability

Armor Durability

Armor durability is based on your armor types(head, torso, legs, feet) and materials(leather, iron, chain, gold, diamond) of the armor that you're wearing. Every time you take damage, you lose 1 point of your armors durability.

Armor durability only decreases when the player is taking damage from:

• Direct attacks from players or mobs
• Getting hit with flying projectiles(snowballs, fireballs from either ghasts or blazes, arrows, etc)
• Touching blocks that can harm the player(lava, cactus, or fire)
• Explosions
• Thorns enchantment

Armor durability does NOT decrease when the player is taking damage from:

• Suffocating
• Drowning
• Taking fall damage
• Falling into the void
• Poisoning
• Damage from potion of harming
• Ongoing damage by being on fire

The Table below represents the armor points of each armor pieces based on their materials

	Leather	Gold	Chainmail	Iron	Diamond
Helmet	56	78	166	166	364
Chestplate	81	113	241	241	529
Leggings	76	106	226	226	496
Boots	66	92	196	196	430

you can read more at 

http://minecraft.gamepedia.com/Item_durability