The X-CALIBER Safety Specs from Frontier are a cost effective safety glass, being light weight and featuring a removable dust guard. The dust guard is also vented, so it gives you two wearing options and neither fog up.
The Dust Guard just clips on to any model X-Caliber, but is only shipped with the Clear model. You can take it off the clear model and put it on a tinted pair if needed.
FE901 - Clear with Guard
FE901S - Smoke with Guard
FE902 - Smoke no Guard