Main Core Goggles. Ounce-for-ounce, the Main Core Goggles are the best value on the market and feature the Variable Lens System (VLS™). VLS™ makes your goggles compatible with both standard lenses (stock) and injection-molded lenses (sold separately) within the same frame. With an expansive viewport, triple-layer foam, and tear-off functionality, they're a heavy hitter on the dirt while being light on the wallet. All-new design offers best-in-class viewport for unparalleled vision. VLS™ (Variable Lens System) design allows transfer of standard and injection-molded lenses in the same frame. Triple-layer face foam with fleece liner. Lexan™ lens offers UV protection. Strap-mounted third tear-off post. Non-slip silicone strap. Microfiber goggle bag included. Clear Lexan™ lens.