A seat is designed for use in a boat and extends in a vertical height direction, a lateral width direction, and a depth direction perpendicular to the width direction. The seat includes a pan main body extending in at least the width direction and the depth and a back main body coupled to the pan main body and extending in at least the width direction and the height direction. The pan main body and/or the back main body is formed from a single extrusion having a uniform cross section in one if the height, width, and depth directions. The pan main body and/or the back main body has an open profile when viewed in the one of the height, width, and depth directions. The open profile is configured to accept and hold a further seat component therein.