Sperry's Iconic boat shoe constructed in BIONIC materials. BIONIC materials are made with plastic recovered from marine and coastal enviornments. Each pair of Sperry Bionic shoes is made from an average of 5 recycled plastic bottles. Two-eye design with rust proof eyelets and functional rawhide laces; genuine hand sewn moccasin construction conforms to your foot for a broken in fit; 360 lacing system for a customized fit; razor cut wave siping for wet/dry traction; stitched on non marking, rubber outsole, providing long lasting durability.