It is difficult to get heavy weight fleece these days...and even more difficult to tell how heavy the fleece will be from the information being provided.  This jacket is sort of light, medium weight material.  Fairly porous, an the only thing that makes it a bit warmer is the majority of the front is lined (the two vertical front panels.  Not sure how long it will last, but it fits well and seems well made, but you can almost see thru the fabric.