Hi Epos7,
As the Pure Green mattress comes in three different firmnesses, make sure you confirm in a phone conversation with Sleep On Latex which model they think will offer you the best chance at success. You are correct that their topper uses an 80/20 organic cotton/polyester cover (no need for wool to pass FR regulations for a topper and keeping wool out of the cover helps to keep the cost down), but if you end up getting a topper and desire that feel of wool you could always procure a wool mattress pad or protector.
Yes, I know quite a few businesses are closed today as it’s a legal holiday with Christmas falling on a Sunday. You should be able to receive your 5% The Mattress Underground discount with no problem.
Their pillows come in low (stomach sleeper) or high (back/side sleeper) lofts, with a lightweight organic cotton covering or a luxury 80/20 organic cotton/polyester covering.
I look forward to learning about your ultimate decision.
Phoenix