It has 375 durability and absorbs 65% of physical damage. Whenever a Character wearing the Bramble Husk is attacked by a Mob, 22.5 damage is dealt to each Mob within a radius of one tile. This effect is not triggered by things such as ingesting a Venom Gland or taking damage from Heat, Cold or Hunger.
It also has the added bonus of preventing damage from Spiky Bushes, Brambles, Bramble Blooms, and Bramble Traps. This means that one can harmlessly harvest Spiky Bushes, damage Brambles and Bramble Blooms without any worry, or stand next to a Bramble Trap when it is triggered and not take any splash damage. Durability of the armor is not decreased when this effect occurs.
In Reign of Giants, the player won't take any damage from harvesting Cactus while wearing the Bramble Husk.