Acrylic dome ports are more sensitive to scratches than glass dome ports (but glass ones are much harder to repair) so it is wise to protect your dome with a neoprene cover for gopro  dome port when you are not using it. The advantage of acrylic domes over glass ones it that the scratches do not show in photos as fast as they do with glass domes. This is especially true for the underwater part of the photo where water fills and eliminates the scratches. On the upper part of the dome, especially if you shoot against bright objects, scratches will be visible. With glass domes scratches are always visible.

This is why it is highly recommended that you get a neoprene cover for gopro dome port that will protect your Split dome from impact, scratches, and dirt while the dome is stashed in your backpack, luggage, boardbag, in the trunk of your car... And it looks cool too. It is an essential accessory for your dome.  You should have the neoprene cover on at all times when you are not using the dome. This Split neoprene cover for gopro dome port will work with any dome that is 6" in size.