Continental 3449030000 WinterContact SI Winter Radial Tire - 225/55R17 XL 101H Continental introduces the all new WinterContact SI with PolarPlus+ Technology for ultimate grip in snow, ice & wet conditions. PolarPlus+ Technology stays pliable in very cold temperatures and enhances grip in slippery conditions like wet, snow and ice covered roads. Traction Grooves provide improved grip in snow. Alignment Verification System provides an early vehicle alignment verification.