Michelin 8521 Stealth Ultra Windshield Wiper Blade with Smart Technology, 21" (Pack of 1) Smart Hinge joints allow the wiper to grip windshield securely across entire blade Patented Smart Hinge cover protects blade from getting clogged with snow, ice and debris Blade ends have independent suspension to adjust to your windshields shape, ensuring secure grip to ends of blade EZ-Lok connector system for quick replacement Independent tests show after 300,000 wipe cycles Michelin Stealth Ultra wipers outperform all industry competitors