The Cumulus the Quilt 300 follows on from the smaller the Quilt 150 and carries over its footbox construction — like the smaller model it has a short 3 mm center zip that closes the footbox or opens the quilt out flat as a blanket. A 300 g goose-down fill in H-baffles gives a comfort rating of 3 °C and a limit of -2 °C at 495 g total weight.
Shell and liner both use 7D Toray Airtastic ripstop fabric at 19 g/m², and the 65 cm shoulder width plus 195 cm internal length match the narrower, closer-fitting cut of the whole the Quilt line. Packed size of 20×15 cm (3.5 l) is typical for this fill weight, and it comes with both a stuff sack and storage sack plus elastic pad-attachment straps.
The short zip and simple quilt construction keep weight and manufacturing complexity down but trade away some versatility compared with a full sleeping bag — best suited to users already comfortable with a quilt-and-insulated-pad system. Made in Poland, available in yellow, sized for users up to 185 cm.