Rab Ultrasphere 5.5 Review | Real Test After 10 Nights | Mountain Group
Andres EscuderoColonel Peregrino's Sleep Insurance for over 600 km of the Camino de Santiago
There's something more important than weight
When we talk about ultralight gear, we often get obsessed with grams.
But after several days of walking, you discover that something even more important exists:
Good sleep.
Because the best gear isn't the lightest.
It's the gear that allows you to wake up the next day eager to keep walking.
During the Camino de Santiago, Iván Plaza used the Rab Ultrasphere 5.5 as his primary sleep system.
After more than ten nights of real use on stone, granite, slabs, grass, and all sorts of surfaces, he has a phrase that perfectly summarizes his experience:
“I know I'll sleep well as soon as I lie down on it.”
My main concern before starting
Before leaving, I had an obsession.
Finding a sleeping pad that was:
- Light.
- Compact.
- Comfortable.
- Well-insulated.
I didn't always know where I would end up sleeping each night.
And I needed a solution capable of adapting to any situation.
“My main concern was having a comfortable and lightweight sleeping pad that took up very little space.”
The Ultrasphere 5.5 was the answer.
Sleeping on any surface
During the Camino, he used it on:
- Stone.
- Granite.
- Slabs.
- Grass.
- Improvised bivouac sites.
And the result was surprising.
“I sleep better on it than in beds in many hostels.”
That statement might seem exaggerated.
Until you've been walking for several days.
Then you perfectly understand what it means.
Impressive comfort
What Iván emphasizes most is the comfort.
Especially for side sleepers.
“It's incredibly comfortable on your side.”
“My sore back and shoulders wake up relaxed.”
The combination of thickness, structure, and cushioning achieves something very difficult:
Offering a sense of comfort far superior to what one would expect given its weight and volume.
Sleep insurance
There's an expression that appears several times throughout the conversation.
“It gives me peace of mind.”
And it's probably the best possible definition.
After walking for hours, arriving exhausted, and setting up camp, the peace of mind knowing you'll get a good rest is incredibly valuable.
“I know I'll sleep well as soon as I lie down on it.”
It's not a technical matter.
It's an emotional one.
Fast and hassle-free inflation
Another highly valued aspect has been its ease of use.
“I set it up in a minute.”
“I pack it away in a flash.”
The valve system works quickly and easily.
And the inflation bag prevents moisture from entering the interior.
Something especially important for preserving the sleeping pad for many years.
Perfectly balanced insulation
Although models with higher R-values exist, they weren't necessary for this adventure.
“I didn't need a higher R-Value because it's summer.”
The Ultrasphere 5.5 offered exactly the level of insulation required for the situation.
“I don't feel cold or damp.”
“It insulates me very well from the ground.”
And that's precisely what's expected from a sleeping pad designed for trekking and three seasons.
What's most surprising
There's something all mountaineers comment on when they see it.
“It's amazing that something so light and compact works so well.”
In fact, according to Iván:
“When you show it to other mountaineers, they all say the same thing: I want one.”
And it's easy to see why.
Are there areas for improvement?
If he had to change anything, it would only be to gain a few centimeters in width for particularly corpulent users.
But he perfectly understands the compromise.
More width means more weight and more volume.
And that's precisely where much of this sleeping pad's appeal lies.
Mountain Group Verdict
⭐⭐⭐⭐⭐ 9.5/10
The Rab Ultrasphere 5.5 is one of those pieces of gear that completely changes the experience of sleeping in the mountains.
- Light.
- Compact.
- Comfortable.
- And extraordinarily practical.
After more than 600 kilometers of walking, Colonel Peregrino summarizes it best:
“It's not cheap. But it's sleep insurance.”
