ZEBEC RIVER RAFTS are hand crafted and built tough with triple reinforced seams; bottoms are made from heavy - duty material; 1.8mm thickness and using full PANAMA method (double strength, stronger than 2000 denier fabric): self - bailing inflatable I-beam floors; pressure relief valves; adjustable lace in thwarts; protective full length side stakes; low - profile inflation valves; heavy - duty D - rings to secure frames and heavy loads; extra large chafe stripes protect top and bottom of the tubes; high bow / stern kick for outstanding performances; and plenty of interior room.