The Convert 30 950 is the goose-down counterpart to the Convert 30 850, trading duck down for 364g of 950-fill-power goose down and dropping total weight to 600g at the same -1°C limit rating. Against the 647g 850-fill version, that's roughly a 47g saving for the same warmth — a smaller gap than at colder temperature grades, since less total fill is needed to hit a mild 3-season rating in the first place.
Construction follows the rest of the Convert line: vertical baffles keep the down distributed, a full-length zipper lets the quilt open flat or close into a sleeping bag, and the Regular cut suits users up to roughly 183cm. Both a stuff sack and storage sack are included, standard for this range.
Made in the USA with RDS-certified down and PFC-free DWR treatment, it's aimed at ultralight 3-season hikers who have already settled on a Convert-style quilt and are choosing between fill grades — here trading a modest weight saving for a higher price than the duck-down equivalent.