Marmot Aspen Mountain 35l Internal Frame Pack Plutonite lens material maximizes clarity and blocks 100% of UVA Patented technologies of High Definition Optics meet or exceed standards of clarity, visual fidelity, and impact resistance HDPolarized lenses improve safety by filtering out 99% of reflected glare O Matter frame material protects against high-velocity and high-mass impact Unobtainium nose pads increase grip when wet