Rab Ionosphere 5.5

Name: Rab Ionosphere 5.5
Brand: Rab

EU available

200gsm Stratus R insulation paired with a TILT reflective layer delivers R 5.5 at 690g. A graduated grip print and oversized edge chambers keep sleepers centered on uneven alpine ground.

$169 typical

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EDITION 01RESEARCHED 2026-08-163 SOURCESREFRESH DUE 2027-02

SUBSTANCE SCORES

substance8.6/ 10

design7.5/ 10

value8.2/ 10

WHY THE PRICE IS JUSTIFIED

The money goes into 200 gsm insulation plus TILT, not merely a claimed temperature: it is a 690 g R 5.5 design with centralizing edge chambers, pump sack and repair kit. That is a defensible warmth-to-weight package.

MATERIALS

Shell20D recycled polyester with TPU coating

Keeps the 5.5-R pad relatively compact.

Insulation200 gsm recycled Stratus R polyester

Traps air to curb convection.

ReflectorTILT film

Reduces radiant heat loss.

SurfaceGraduated grip print

Reduces sleeping-bag slip.

CRITERIA

9/10

Sleep Support

8 cm depth and oversized edge chambers keep the sleeper centralized.

9/10

Thermal Insulation

R 5.5 via Stratus R insulation plus TILT.

7/10

Leak Durability

20D TPU-coated fabric prioritizes carry weight over brute robustness.

9/10

Setup And Repair

Two-way valve, pump sack and repair kit included.

9/10

Carry Efficiency

690 g regular is strong for R 5.5.

9/10

Surface Livability

Grip print and hybrid rectangle work well for movement and bag retention.

IDEAL FOR

·alpine trekking
·cold three-season or mild winter camping
·side sleepers
·compact cold-weather kits

NOT FOR

·unprotected abrasive campsites
·ultralight summer-only buyers

DESIGN & ERGONOMICS

The hybrid rectangular profile is more accommodating than a severe mummy; grippy print and raised outer chambers reduce slide and roll-off. The low-profile two-way valve is cleanly integrated.

LONGEVITY

The roll-away sack contains a repair kit. Use a footprint and avoid abrasion: the 20D construction is a calculated warmth-to-weight choice, while the two-way valve and included repair provision support field ownership.