Rab Ultrasphere 5.5 | Insulated Inflatable Mat for Winter and Mountain

Description

The Rab Ultrasphere 5.5 is an inflatable sleeping mat designed for winter mountaineering, expeditions, and cold conditions where thermal insulation is critical. It combines a lightweight construction with advanced technologies such as TILT and Stratus™ R, offering excellent heat retention in a compact format.

It is intended for mountaineers, ski tourers, and users who need to sleep on cold ground or snow without compromising the weight of their gear.

Real technical performance

The TILT system reflects body heat back to the user, while Stratus™ R insulation reduces convective heat loss. This allows for a high level of comfort even in cold conditions.

With an R-Value of 5.5, it is positioned as a mat suitable for winter use. Despite its insulating capacity, it maintains a contained weight and compact volume, ideal for technical activities where weight remains a key factor.

Quantitative technical specifications

• Weight: 615 g (Regular)
• Dimensions: 183 x 51 x 8 cm
• Long Dimensions: 196 x 64 x 8 cm
• R-Value: 5.5
• Thickness: 8 cm
• Pack size: 24 x 12 cm (Regular)
• Pack size Large: 30 x 14 cm
• Product code: QMA-11

Comparison within the range

Compared to the Ultrasphere 1.5, it offers much greater insulation for cold weather use. It is the right choice when thermal performance is a priority over minimum weight.

Recommended use

• Mountaineering and winter mountain activities
• Ski touring
• Cold weather expeditions
• Trekking in cold conditions

Is it for you?

Yes, if...

• you need real insulation for cold or snow
• you do technical activities in winter
• you are looking for a balance between weight and thermal performance

No, if...

• you will only use it in summer or temperate climates
• you prioritize minimum weight over insulation