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Lightweight synthetic

Images: Rab and its retailers. Used for product identification.

Rab

Rab Radeon Synthetic Sleeping Bag (0°C)

960 g synthetic mummy with an ISO comfort of +5 °C, from about £120 at UK specialists.

Weight
960 g
Comfort
+5 °Climit 0 °C
Packed
20 × 35 cm

Best price found

£111.95

at Absolute Snow · Pre-order · RRP £139.95

View Deal
  • Ultralight Outdoor GearIn stock · RRP £139.99£119.99View Deal
  • AlpinetrekIn stock · RRP £139.95 · In stock (Regular, left zip)£125.96View Deal
  • RabIn stock · Direct from maker£140View Deal

Prices checked 31 October 2026. We may earn a commission on these links.

  • Synthetic fill
  • Sidewall baffles
  • Insulated collar
  • Two-way zip
  • Recycled fabrics

Specifications

Weight
960 g (Rab figure, regular (215 cm). Ultralight Outdoor Gear lists Regular 1005 g, Long 1098 g. Product code QSS-21.)
Packed size
20 × 35 cm
Comfort
Comfort +5 °C / limit 0 °C
Insulation
Recycled Stratus synthetic sheet insulation, WARM WAVE construction
Season rating
2–3 season
Shell & zip
Outer: 20D Atmos recycled polyester ripstop, 41 gsm, fluorocarbon-free DWR. Lining: 20D Atmos recycled polyester, 38 gsm
Rating Standard
ISO 23537-1:2022 rating (extreme -15 °C per Rab)
Fill Note
Fill weight not stated by Rab. Regular fits up to 185 cm, Long up to 200 cm.
Zip
Two-way YKK zip with insulated baffle and anti-snag guard (3/4 length per Ultralight Outdoor Gear); left or right
Manufacturer page →

Pros & cons

  • Under 1 kg with a lab-tested ISO comfort of +5 °C and limit of 0 °C
  • Stratus fill 'continues to insulate when damp and dries quickly' (Ultralight Outdoor Gear verdict)
  • Sidewall baffles and a cut 'generous without feeling restrictive' suit side sleepers (Ultralight Outdoor Gear)
  • Ultralight Outdoor Gear notes it 'sits heavier than down alternatives'
  • New 2026 bag: no independent editorial review found yet, only a retailer's verdict

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