It should be NB, the New Balance brand.

New Balance's outdoor shoes are designed with the idea of ??"loving adventure sports" as the main axis to meet the needs of various outdoor sports. Lake, stream and mountain forest walking fall into this category. The main functions of outdoor shoes are comfort and multi-directional stability. New Balance sports sandals are mainly aimed at athletes involved in various hydrophilic activities. Their main functions are: water-draining and quick-drying materials, and specially designed outsole particles that focus on grip.