You can check its durability mentally by 'bouncing' an attack off it's surface. 'See'and feel the virulent words/emotions/thoughts rebounding from it and returning to the sender.-
If you are feeling kind, you could visualise them being earthed)
Know that your suit of astral armour will let none of the stings and arrows of outrageous colleagues/partners / family members in, and that your callousness to their entreaty or attack is complete.
Via the little book of Pocket spells by A. Moon