The Revelation 30 950 shares the -1 °C limit rating with the 850-fill version, but at 505 g instead of 544 g thanks to 327 g of 950-fill-power goose down. That 39 g gap illustrates what a fill-power jump buys at the same thermal target — less down mass for the same warmth, at a higher cost for the better raw material.
The construction uses an uneven fill distribution (roughly 60/40 favoring the top layer), which fits top-quilt logic — the underside gets compressed against the pad by body weight, so down there does less work. An open footbox, pad attachment loops, and 192 cm of internal length for users up to 183 cm round out the spec sheet. The 10D nylon ripstop shell is DWR treated, the down is RDS certified and PFC-free, and both a stuff sack and storage sack are included.
For ultralight hikers counting grams, this 950-fill version is the logical upgrade over the 850-fill quilt once the budget allows paying for lower weight at matching warmth.