I agree that the cage looks better without that lame factory padding but I've cracked my head hard enough on an unpadded cage that I saw stars and was dazed pretty badly for a minute or too. Some decent slip-on padding can be found in the plumbing/pipe row of your local Home Depot, Lowes, etc. They carry pre-slit high density foam insulation and most have pre-slit neoprene insulation too.
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