Don't know about that, but another thing to try is to insert a vapor block. PSolarX has one that they sell for $5, but I googled around and found that it's just a hunk of foam cut to fill in the gap formed when the fabric stretches straight from your nose to your cheek. I made one in about 15 minutes (took a couple of tries) and taped it inside the balaclava with carpet tape. Stops most of the vapor.