Wool Felt is a non-woven textile. There is no thread or weaving involved in production. It originates as wool roving and by adding heat, moisture and agitation, the roving compacts and matts together tightly to form what we refer to as pure wool felt.
Felted Wool is a woven textile. There is thread and weaving involved. Like wool felt, it originates as wool roving, but the roving is spun into thread after being cleaned and carded. This thread is then woven into wool cloth, which is washed in hot water and dried on high heat to emulate the “add heat, moisture and agitation” process used to make wool felt. This process turns wool fabric into felted wool.
Felted wool contracts into a thicker 'puffier' texture than the original cloth. This puffiness translates into “soft and fluffy,” which is why we love it! The results you achieve when felting wool will vary depending on the weave of the fabric, the wool content (whether or not it is 100% pure wool) and wash/dry temperatures.