The SL309 from Westlake is an all-purpose, heavy-duty all-season tire that's designed for use on light trucks and SUVs. Backed by a 40,000 mile limited manufacturer tread life warranty, the SL309's staggered tread blocks improve traction in dry, wet, and light winter weather conditions while a steel-belted construction increases strength and durability for a higher load carrying capacity and longer tread life.