The Single lens creates a 15% larger vision field than dual lens, due to the gap of two lenses is removed.
Without a gap in single lens, there is not any possibilities for ice melted to run through the gap foam in between a dual lens which causes a blurred vision.
Available Choices:
PC Lenses+Inner Anti-Fog Film, PC Lens+Outer Photochromic Film
PC Lenses+Outer Photochromic Film and Inner Anti-Fog Film.
PC Lenses+Outer TAC Polarized Film,
PC Lenses+Outer TAC Polarized Film and Photochromic Film
PC Lenses + Inner Anti-Fog Film + Outer TAC Polarized Film