• 1. Good quality silicone material with a larger size, good sealing, oil resistance, and good faceseal
• 2. Patented buckle, easy to assemble
• 3. 2-point support, single-strap headband with adjuster, quick fastener.
• 4. Bottom exhalation valve design, good for sweat flow out and easy to clean.
• 5. Comply with EN140: 1998 (BSI Certificate: CE 727082).
