Making sure you are buying pure, 100% Wool Felt
Most "Woolfelt" found online is only part wool!
All wool felt should have the fiber content listed with the product. When you look at the specific fiber content, often you'll see that the wool content is actually a low percentage of the felt, either 20%/80% or 35%/65% wool/rayon.
Although less expensive, this is a different quality felt than 100% pure wool felt.
It does not have the integrity, the touch, the long wearing properties, or the ability to form and mold with steam heat that pure wool does.
Unless the felt is specifically advertised as 100% pure wool felt, chances are very good that it is a rayon/wool blend.