I liked the Eco Posh fitted, Kawaii bamboo double inserts, and wool cover combo so much that I put another one on little E to take her to the grocery store. After about 90 minutes in the car seat, I took her out and felt some moisture on her bum. The fitted was wet on the outside and I think the wool wicked through. Hmmm, I must not have lanolized the covers correctly. I will redo it tonight, let them dry over the next few days, and try again with this combo to see if that helps.
Any wool-using mamas with tips, please feel free to share!