The Cumulus neo Quilt 300 pushes the neo series into three-season territory — 300 g of 900 cuin goose down (96/4 ratio) in horizontal H-baffles gives a comfort rating of 3 °C and a limit of -3 °C at 455 g total weight. Compared with the lighter Quilt 150, this model uses H-baffle rather than sewn-through construction, which better resists down migration.
One notable detail is a draft collar around the shoulders — not a given on backless, zipperless quilts, and it helps trap warm air right where an open design is most prone to leaking it. A closed, anatomical footbox and elastic pad-attachment straps for 50–60 cm mats round out the functional basics. Packed size of 19×15 cm (3 l) stays reasonable.
The down is RDS-certified, the quilt is made in Poland, and it fits users up to 185 cm. A weight-per-degree figure of 151.7 g/°C signals a middle-ground rather than a top-tier efficient construction — still a solid pick for summer and three-season shoulder trips.