The weather can turn from nice and clear to dark and rainy in less than an hour when you're above treeline, so be ready for surly alpine weather with The North Face Men's FuseForm Dot Matrix Jacket. The FuseForm is fitted with a waterproof, 2. 5 layer shell with fully taped seams and is engineered with minimal seams to save weight. To maintain comfort while you hike, the FuseForm features pack friendly hand pockets, two underarm ventilation zips, and a fully adjustable hood. The jacket weighs a measly 12 ounces, so you can bring it along on your longer multi day trips, without it weighing your pack down too much.