It has 1050 durability and absorbs 60% of physical damage when worn normally. When the player is hiding inside the shell (by right-clicking on it in the inventory), it absorbs 100% of physical damage.
It works like a Bush Hat in that aggressive mobs will not attack the player if they hide before they aggro on them. Additionally, after hiding inside the shell for around 5 seconds, all attackers will lose interest in the player and stop their attacks. This means that the shell can be used to avoid Hound attacks and Shadow Creatures.
If the player is attacked by Charlie while hiding inside the Shell they will receive no Health damage but the hurt animation will play making the player come out of hiding and still take the Sanity damage.
- Unlike other armors which can't block more damage than they have durability left, Snurtle Shell Armor completely negates damage from hits strong enough to destroy it.
- Willow, Wendy and Wigfrid will have their hair clip through the armor, while Webber has spider legs clip through it. This is only a visual issue, and doesn't affect gameplay.