Nunn Bush Men's Otto Plain Toe ChukkaThese versatile Otto chukkas are the perfect way to welcome comfort and style Leather, suede, or man made upper treated with Scotchgard for water and stain protection Removable molded EVA footbed with memory foam cushioning Flex Technology allows for a wide range of foot movement Footbed created with 20% BLOOM, and algae based product, which will return 32 liters of clean water to habitats and clean 20 cubic meters of air Non marking, high abrasion