The "B" in Ariat boots refers to the boot width size. In the context of Ariat's sizing system, "B" stands for a narrow width. Ariat offers a range of width options to accommodate different foot shapes, including narrow (B), regular or medium (M), and wide (W). Understanding the width designation is crucial for achieving optimal comfort, as it ensures a snug fit that enhances both the support and overall performance of the work boot.