
Rab
Rab Ionosphere 5.5
$169
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A Triangular Core Matrix and ThermaCapture barrier hold R 4.5 at roughly 350g - the lightest warmth-to-weight ratio here. The WingLock valve cuts crinkle noise 83% versus the prior XLite.
The overall score averages substance, design, and value.
Compared with 8 other products in edition 1.
This product: 8.1 out of 10
Three inches of loft and horizontal baffles support back and side sleepers.
This product: 8.7 out of 10
R 4.5 from Triangular Core Matrix and ThermaCapture.
This product: 7.3 out of 10
30D rip HT nylon is stronger than the lightest fabrics but remains trail-weight.
This product: 9 out of 10
WingLock gives fast one-way inflation, deflation and in-use micro-adjustment; field kit included.
This product: 10 out of 10
About 350 g regular with R 4.5 and 3-inch depth.
This product: 8 out of 10
NXT construction reduces noise 83% versus its predecessor.
Its price is primarily a warmth-to-weight achievement—R 4.5 at around 350 g—with 30D nylon, a sophisticated internal matrix and an easily adjusted WingLock valve. It is not the plushest or most durable here, but it is technically efficient.
The horizontal baffles feel controlled rather than hammock-like; NXT’s quieter construction makes a material usability improvement. Choose Regular Wide if shoulder room is important.
30D rip HT nylon
A credible weight/durability balance rather than paper-thin UL fabric.
Triangular Core Matrix
Suppresses convective air movement and supports the sleeper.
ThermaCapture radiant barrier
Returns radiant heat for R 4.5 insulation.
WingLock one-way valve
Allows rapid inflation, dump deflation and fine adjustment.
Includes a pump sack, stuff sack and field repair kit. WingLock components are designed for straightforward service; still use a protective tent floor and keep the 30D shell away from grit and sharp debris.




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$130