New valve design helps make breathing easier, and helps reduce heat and moisture. The Cool Flow valve opens easier. Made from soft, resilient silicone and heat-resistant plastics. Dual-mode head harness unique head harness design adjusts easily so user has the option of wearing the respirator in either traditional or drop-down mode. Advanced silicone material provides a softer feel on the face. Unique adjustment design helps reduce tension and pressure points on the face for unsurpassed comfort.