Rubber boots with a sole in Ultimate Grip Concept ( UGC for short). UGC was developed by Viking and is a trademark for special sole technology developed and tested in Norway. The sole is adapted to different types of terrain and offers stability and tread resistance combined with light weight and wear resistance. UGC® has these unique characteristics: Vikings rubber compound with a hardness degree of 60 Shore for maximum grip and durability. Asymmetrical tread pattern repels water for good grip. Multi-directional tread pattern provides grip, good rolling feel and quick braking response at all angles and on all terrains. Built-in pivot bar provides extra grip on rocks, roots and slippery surfaces.