Off topic a bit here. It goes to show that the s10 was make by the lowest bidder with how brittle the lenses are, it's not an old design but yet they didn't incorporate them. I had trust in this mask when in service and last thing on want while wearing it in a gas environment is for a bit of shrapnel or a fall or what ever to hit a lense and cracked or smash it thus breaking the air seal. Don't get me started on the gsr that's even worse build quality can see glue round the edges of the lense on them.