The North Face says about the Glacier Pro Full Zip Men's
As fleeces go, the Glacier is a classic. It's made from microfleece that delivers lightweight warmth thanks to its unique lofted structure. Air pockets trap air without compromising breathability, so you stay warm without getting sweaty. Abrasion-resistant overlays on the upper body and sleeves give you an added durability boost. It's the ideal layering piece to wear with a waterproof shell.