Size: Small Filter Class: NIOSH-certified N95 (95% or greater filter efficiency against non-oil-based particulates)Design: Patented AirWave pleated wave design which increases surface area to improve breathability and reduce breathing resistance without needing an exhalation valve Shell: Tough Dura-Mesh shell that resists collapsing in hot and humid conditions to maintain its shape longer Comfort: Soft foam nose cushion with a pinch-free, contoured nose bridge (no metal noseband to adjust)Compliance: 100% PVC-free, meeting heat and flame resistance standards in