3M P100 Disposable Particulate Cup Respirator w/ Cool Flow Exhalation Valve $5.29 + Free S&H w/ Prime or $35+

3M P100 Disposable Particulate Cup Respirator with Cool Flow Exhalation Valve for $5.29 with Free Shipping with Prime or $35+. Highest rated filtration efficiency. Provides reliable respiratory protection of at least 99.97% filtration efficiency against certain oil and non-oil based particles. 3M Cool Flow Exhalation Valve reduces heat build-up inside the respirator, making it suitable for work situations involving heat, humidity, or long periods of wear.