At 184g in a men's medium, the Helium UL is the ultralight standout in this evaluation — 51% below the category average of 378g. Designed specifically for trail running and fast-and-light use where minimum weight is the primary objective.

Packs to a remarkably small stuff sack. Best-in-test packability for a fully waterproof shell — fits in a jersey pocket or hip belt pocket for trail running and ultralight hiking.

Pertex Shield waterproof-breathable fabric delivers reliable protection in sustained rain. Performs well in standard trail conditions. Less robust than 3-layer GORE-TEX alternatives in extreme alpine conditions.

Excellent breathability for a fully waterproof shell. Pertex Shield construction manages high-output exertion moisture effectively — preferred for trail running and aerobic hiking.

Athletic, trim fit optimized for high-output movement. Minimal seams and articulated patterning deliver excellent range of motion for trail running and technical hiking.

Ultralight construction prioritizes weight savings over maximum durability. Well-suited for trail running and day hiking; less durable than heavier 3-layer alternatives for sustained technical use.

Taped seams and waterproof zipper deliver reliable construction for an ultralight shell. Build quality is appropriate for the weight class and intended use case.

Competitive price point for an ultralight waterproof shell with Pertex Shield construction. Strong value for trail runners and ultralight hikers who prioritize minimum weight.