The mid weight section is designed to give you the option of if you require a good mid layer fleece jacket to keep you warm, or a nice micro fleece pull over. If you are looking at a more thermal warmer kind of fleece then a full zip jacket with a higher fleece spec will be better. If you are more active in the outdoors and require a mid layer a micro fleece provides much better freedom of movement for the more active walker, Skier and snowboarder.
For a better quality fleece that will last and look allot better over time, look at the big brands like The North Face and Mountain Equipment, They tend to use Polartec Fabric and will generally not pile over time through wear and tear, although a more entry level may do so if it is being used in high abrasion sports or wearing rucksacks, But these are still perfect as a warm thermal layer.
