The Sierra features the Airshield Technology to provide a complete seal around your eyes. Provides total protection from the elements including dust, wind, and other airborne irritants. The Seal Protection Factor (SPF) of 100, means the Airshield provides a perfect, 100% seal around the orbits of your eye. Also ideal for relieving chronic dry eyes. The closed-cell foam material is unaffected by the weather, is resistant to perspiration and grime, allowing for a longer lasting more comfortable removable Airshield.
Patented filtering vents manage air circulation, reduce fogging, and keep your vision free from any distortion that may be caused by lens fogging.