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An ultra-technical mattress with carefully designed shaping for optimal comfort is designed for bivouacking on a hike. The new SleepinBed ultra light ensures a comfortable 4°C temperature, ideal for a night under the stars. And the thickness of the mattress varies and adapts to comfort requirements. The foam is perforated in diamond shapes at the head and hips and in channels at the torso. The ergonomic collar at the shoulders and the anti-cold zip guarantee optimal protection against the cold. And thanks to its patented elasticated flapped duvet system, the SleepinBed ultralight is more comfortable than a conventional sarcophagus sleeping bag.