The Ultra 3 is our amphibious shoe perfect for adventures on land and sea. The lightweight hexagon upper design is breathable, non absorbent and drains water easily. The new hex grip outsole made with sticky rubber gives you all that good underfoot feeling, flexibility and incredible wet and dry traction. Now made using algae based BLOOM foam which offers the first sustainable alternative to the synthetic and petrochemical EVA prevalent in today's market. Using algae biomass helps offset the significant use of petroleum ingredients found in conventional flexible foams.