Here is how these two sleeping pads compare on the numbers. The Hypersphere Ultra 7.5 Down leans on low weight while the Dura 8R answers with warmth, so the pick comes down to which you value.
| Rab Hypersphere Ultra 7.5 Down | Exped Dura 8R | |
|---|---|---|
| GearScore | 77✓ | 70 |
| Warmth (R-value) | 7.3 R | 7.8 R✓ |
| Weight | 21.5 oz✓ | 2 lb 2.4 oz |
| Warmth-to-weight | 1.20 R/100g✓ | 0.80 R/100g |
| Packed size | 3.69 L✓ | 6.64 L |
| Thickness | 3.1 in | 3.5 in✓ |
| Durability | 12 /100 | 96 /100✓ |
| Price | $250 | $230✓ |
| Features | 2Pump sack included, Repair kit included | 3Pump sack included, Two-way valve, Repair kit included✓ |
| Type | Inflatable | Inflatable |
| Shape | Rectangular | Rectangular |
Highlighted cells mark the better spec: Hypersphere Ultra 7.5 Down in blue, Dura 8R in amber. A blank spec is never counted as a win. GearScore is the rating for the Overall use-case (0 to 100). Pick another above to re-score. Prices are current MSRP.
The Rab Hypersphere Ultra 7.5 Down against the Exped Dura 8R is a study in priorities. The Hypersphere Ultra 7.5 Down wins on low weight and warmth-to-weight, and the Dura 8R pushes back on warmth and cushion.
The Hypersphere Ultra 7.5 Down is 13 oz lighter, stronger on warmth-to-weight, and more packable (3.7 L vs 6.6 L). The Dura 8R is warmer (R 7.8 vs R 7.3), thicker for more cushion, and more durable. On the default GearScore the Hypersphere Ultra 7.5 Down leads 77 to 70.
Pick the Hypersphere Ultra 7.5 Down if you care most about low weight and warmth-to-weight, which makes it the better call for counting grams on long miles. Pick the Dura 8R if warmth and cushion matter more to you, or you are focused on colder nights and shoulder-season trips.
The Rab Hypersphere Ultra 7.5 Down. It is 13 oz lighter than the Dura 8R.
The Exped Dura 8R. It is warmer (R 7.8 vs R 7.3) than the Hypersphere Ultra 7.5 Down.
The Rab Hypersphere Ultra 7.5 Down, 77 to 70 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the Hypersphere Ultra 7.5 Down for low weight, or the Dura 8R for warmth. The spec table above shows exactly where each wins.