MICHELIN Premier LTX All_Season Radial Tire-255/055R18 109V Half-worn Premier tires are safe because of EverGrip Technology which combines an evolving tread with a high traction compound for enhanced wet-braking capabilities. With EverGrip Technology, expanding rain grooves widen and emerging grooves open as the tire wears to maintain traction. Extreme amounts of silica in the EverGrip compound provides exceptional wet grip for everyday handling. Sunflower Oil keeps the EverGrip compound flexible in lower temperatures along with many tread blocks and sipes that act as biting edges to cut through the snow.