A close look at two sleeping bags buyers cross-shop. The Specter 15F leans on warmth while the Neutrino Pro 500 answers with low weight, so the pick comes down to which you value.
| Mountain Hardwear Specter 15F | Rab Neutrino Pro 500 | |
|---|---|---|
| GearScore | 85✓ | 65 |
| Comfort rating | 25 °F✓ | 26 °F |
| Weight | 2 lb 4.4 oz | 2 lb 0.3 oz✓ |
| Warmth-to-weight | 4.4 /100g | 4.8 /100g✓ |
| Packed size | 6.5 L | n/s |
| Fill power | 800 FP | 800 FP |
| Price | $720 | n/s |
| Fill | Down | Down |
| Style | Bag | Bag |
| Shape | Mummy | Mummy |
Highlighted cells mark the better spec: Specter 15F in blue, Neutrino Pro 500 in amber. A blank spec is never counted as a win. A lower comfort rating in °F means a warmer bag, so the warmer bag takes that row. GearScore is the overall rating (0 to 100); re-weight it on the full bag comparison. Prices are current MSRP.
Put the Mountain Hardwear Specter 15F next to the Rab Neutrino Pro 500 and the trade-offs are clear. The Specter 15F wins on warmth, and the Neutrino Pro 500 pushes back on low weight and warmth-to-weight.
The Specter 15F is warmer (rated 25°F vs 26°F). The Neutrino Pro 500 is 4 oz lighter and stronger on warmth-to-weight. On the default GearScore the Specter 15F leads 85 to 65.
Pick the Specter 15F if you care most about warmth, which makes it the better call for colder nights and shoulder-season trips. Pick the Neutrino Pro 500 if low weight and warmth-to-weight matter more to you, or you are focused on counting grams on long miles.
The Mountain Hardwear Specter 15F. It is warmer (rated 25°F vs 26°F) than the Neutrino Pro 500.
The Rab Neutrino Pro 500. It is 4 oz lighter than the Specter 15F.
The Mountain Hardwear Specter 15F, 85 to 65 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the Specter 15F for warmth, or the Neutrino Pro 500 for low weight. The spec table above shows exactly where each wins.