Nokian Nordman 5 Studded All-Season Radial Tire - 185/55R15 86T Bear Claw Stud Technology - We have formed a wedge-formed claw-like area in front of the stud. This bear claw preload and pretension the rubber compound in front of the stud during braking situations and keep the stud longer in optimal position if compared to conventional ways to fasten studs to tires. Stabilization Zone - Special stabilization zone between shoulder blocks to improve bare road stability and also lateral grip as shoulder blocks stay on optimal angle even under heavy loads. Polished Main Grooves - Snow and slush come easily off the tire along the smooth and shiny grooves. Thanks to the tread pattern, the tire cleans easily and runs effortlessly in deep snow and slush on even the most challenging roads. Completely HA-free tire - Only purified low-aromatic oils have been used in the production of this tire. Nokian Tires has succeeded in becoming the worlds first tire manufacturer to produce a clean tire with excellent wet grip and other safety properties.