A sleeping berth made of canvas stretched within a marginal frame of galvanised pipe. It is usually tapered to one end, and the pipe at the shipside edge is attached by hinged brackets so that the whole cot can fold up against the side of the hull.
The most comfortable form of sleeping accommodation when a boat is going to windward and therefore heeled, especially if a tackle is fitted to the inboard side. This allows vertical adjustment so that the sleeper can adjust his cot to the horizontal. Strangely seldom seen on cruising yachts. (Compare with the Root berth whose canvas rolls up towards the shipside.).