Layer of activated carbon provides comfort relief against nuisance levels of both organic vapors and acid gas. Features soft foam nose cushion, staple-free construction and collapse-resistant double shell. Contoured nose-clip provides greater comfort and helps reduce potential fogging. Smooth latex-free polymer head straps won’t catch on hair. No pre-stretching needed. Model 1745 features a premium oversized valve to expel hot air for cool comfort. NIOSH Approved. Made in USA.