I've never gone into anything below 20F so I doubt I'd ever need it for temp reasons. What interests me is this:
Breathing Resistance: Ease of breathing was tested using a Dwyer Series 477 digital manometer to measure in mask pressure during simulated light, medium, and heavy breathing.Fluctuations in pressure were Ī 0.5 inches of water, indicating minimal resistance under heavy breathing imposed by the air chamber of the mask. Ease of breathing is a critical feature during high performance outdoor activities.
Maybe it won't make me feel like I'm being waterboarded every time my mask gets damp and loose when breathing heavily.