No scratches & fingerprints: Accidental touches and scratches to the front element are reduced because the silicone cap can prevent direct from touching on the glass. You will have a better shooting on your DJI Osmo Action camera.
Waterproof & Dustproof: If your lens is not weather sealed, please do not let it get wet. A clean and dry front element will allow the camera to deliver the better image quality that you expect.
Fit for DJI Osmo Action Lens: Your lens may be much more expensive, adding a lens cap will bring you more benefit.
Easy to Clean: Silicon lens cap can be directly washed by water, alcohol, cleaning liquid. After drying, simply put it back on the lens.