Parallel Polarized Gray Replacement Lens Size:- Bivvy keeps condensation at bay

Bivvy keeps condensation at bay and reflects 70% of your body heat back to you

It now uses a chafe-free seam construction that's perfect for a pack will and keep you going farther

The other major unique advantage of this configuration is that you are able to create a 3-to-1 mechanical advantage

Bring these on long trips

Perfect for use in the spring and summer with a comfort temperature (men) of +2°C (women +7°C )

Parallel Polarized Gray Replacement Lens Size:- Bivvy keeps condensation at baySmith Optics' interchangeable performance series provides sleek, lightweight performance and convenient options for changing conditions. These replacement lenses feature Smith's famous carbonic TLT lenses for clarity, and a hydroleophobic coating for moisture and smudge resistance.