Full-Facepiece Respirator Prescription Lens Inserts SMOKE SPEC Quality prescription lens insert for full-facepiece respirators. #276 SMOKE SPEC View Details $38.95 – Free USPS First Class Shipping – (does not include lenses) Add to cart #279 SMOKE SPEC View Details $39.95 – Free USPS First Class Shipping – (does not include lenses) Add to cart