Bridgestone's ALENZA Sport A/S Runflat is composed of an all-season compound that forms into an optimized tread pattern that improves wet, dry and winter gripping ability for excellent all weather traction. The all-season compound maintains tire flexibility while tread elements enhance grip. The ALENZA Sport A/S Runflat features four wide circumferential grooves that combat hydroplaning risks by dispersing water away from the tire's footprint, further improving winter gripping capabilities. This tire is a run flat model, which means this tire is able to handle the weight of the vehicle and passenger under the circumstance that air pressure begins leaving the tire. Overall, the ALENZA Sport A/S Runflat is an excellent tire with assured safety for a confident, comfortable ride.