The Flat Guard level of WTB tires features an Urban Armor Casing, which provides additional rubber throughout the entire casing and sidewall to deliver additional puncture protection while also ensuring it holds up to cornering on asphalt and even the occasional curb rub. Additionally, Flat Guard tires utilize an additional layer of rubber beneath the whole width of the tread to provide even more thickness in the region where the tires are most likely to encounter sharp, intrusive objects.