The Alpha 120 Hoodie is Sambob's heaviest fleece hoodie, made from Polartec® Alpha Direct at 120 gsm — roughly 7.5 oz. It's built for serious cold: an early-spring or late-fall hiking layer, or a toasty piece worn under a puffy through the depths of winter. Breathable and quick-drying despite the extra warmth, it still vents well when you're moving.