This is a sort of out of phase 'reality bubble'
which surrounds you almost like a reality away from reality with bits of salt air, ocean waves and sunlight.
A mind vacation, perhaps great for sleeping with or just escaping to when you are in places or situations you cannot remove yourself from.
Perhaps you simply need a quick break, or even a day working at beach.
This world is yours only, you will find the toxic energies of those around you, a little harder to reach you and affect you.
Not really a shield per say, but more along the idea of removing yourself from situation by not even being there (energetically)
The effects are quite solid, so you may even feel the heat of the sun, smell salt/ions in the air etc.
The effects can stay with you quite a while after listening as well.
Use as needed.