SeaArk has discovered the recipe for constructing the toughest boat on the market. Our 60" bottom Jons are built from .100 gauge alumium. Our caprails are extruded and oversized to strengthen the top portion of the boat. Oversized ribs and rib doublers are used on the front four ribs, where the boat can take a lot of abuse. A 3/16" extruded keel is used to reinforce the center of the boat where the boat is most likely to be docked on rough surfaces.