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The original mats are important because most Wingspan expansions are designed with them as the foundation; the Oceania mat is typically used when you're playing with nectar.
Why switch to natural rubber? Some players prefer this neoprene-like material because it's easier to remove cards from them. Each playmat is sold separately so you can buy exactly as many as you need (i.e., if you usually play Wingspan with 1 other person, you can buy 2. A full set for the base game and Oceania would be 5 mats).
Note: These were erroneously called "neoprene," which is a synthetic rubber. These are made from natural rubber.
