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Thermarest Oberon 0F/-18C

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The Thermarest Oberon 0F/-18C is a fast and light down sleeping bag designed for mountaineers, skiers and adventurers that push deep into frigid backcountry winters. 

Providing the crucial protection for adventures into colder climates in the heart of winter, the Thermarest Oberon 0F/-18C sleeping bag has been engineered to protect athletes from extreme conditions during extreme pursuits. Every gram has been meticulously designed to add warmth and security for the user. Certified by the Responsible Down Standard, the bag's 800-fill Nikwax Hydrophonic Down repels moisture and stays warm in damp conditions. Get better rest while keeping the cold at bay with the Oberon. Storage sack and compression stuff sack included.

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: Down Sleeping Bags


  • 800-fill Nikwax Hydrophonic Down : Dries three times faster than untreated down without using dangerous PFCs.
  • SynergyLink Connectors: Integrate the bag with a mattress for optimal comfort and efficiency; removable for versatility.
  • Zoned Insulation: Maximises warmth and saves weight by intentionally placing fill where you need it most. Using 60% of the fill on top and 40% on the bottom gives the Oberon the optimum balance of warmth-to-weight.
  • Toe-asis Foot Warmer Pocket: Ergonomic toe box that rapidly warms cold feet in a pocket of warm down.
  • Quilt and Blanket Loops: Customise your sleep system by layering our quilts or tech blankets for increased warmth.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.
  • Additional features: Heat-trapping draft collars, full-length zipper draft tubes, differential cut, snag-free zipper, cinch-able hood and external zip pocket.


Small Regular  Long
Colour Element Element Element
Weight (Standard) 2 lbs 5 oz 2 lbs 8 oz 2 lbs 10 oz
Weight (Metric) 1.03 kg 1.12 kg 1.21 kg
Width (Standard) 28.5 in 31 in 32.5 in
Length (Standard) 73 in 80 in 85 in
Height (Standard) 5.5 in 5.5 in 5.5 in
Fits (Standard) 66 in 72 in 78 in
Fits (Metric) 168 cm 183 cm 198 cm
Girth, Shoulder (Standard) 57 in 62 in 65 in
Girth, Shoulder (Metric) 145 cm 157 cm 165 cm
Girth, Hip (Standard) 56 in 57 in 58 in
Girth, Hip (Metric) 142 cm 145 cm 147 cm
Girth, Foot box (Standard) 44 in 46 in 51 in
Girth, Foot box (Metric) 112 cm 117 cm 130 cm
Packed dimension (Standard) 10 in x 17 in 10 in x 17 in 10 in x 17 in
Packed dimension (Metric) 25 cm x 43 cm 25 cm x 43 cm 25 cm x 43 cm
EN Comfort (C) -10 C -10 C -10 C
EN Comfort (F) 14 F 14 F 14 F
EN Limit (C) -18 C -18 C -18 C
EN Limit (F) 0 F 0 F 0 F
EN Extreme (F) -37 F -37 F -37 F
EN Extreme (C) -38 C -38 C -38 C
Recommended Temperature Comfort (F) 14 14 14
Recommended Temperature Comfort (C) -10 -10 -10
Recommended Temperature Limit (F) 0 0 0
Recommended Temperature Limit (C) -18 -18 -18
Fill material 800 Fill Goose Nikwax Hydrophobic Down RDS 800 Fill Goose Nikwax Hydrophobic Down RDS 800 Fill Goose Nikwax Hydrophobic Down RDS
Fill weight (Standard) 1 lbs 9 oz 1 lbs 11 oz 1 lbs 14 oz
Fill weight (Metric) 0.71 kg 0.78 kg 0.84 kg
Shell fabric 20D Polyester Ripstop w/DWR 20D Polyester Ripstop w/DWR 20D Polyester Ripstop w/DWR
Lining fabric 20D Polyester Taffeta 20D Polyester Taffeta 20D Polyester Taffeta
Zipper side Left Left Left

Customer Reviews
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  • mat straps
  • ground
  • light
  • boxes
Stephen M.
United Kingdom United Kingdom

Warm and roomy

This bag just ticks all the boxes. It’s warm, roomy, light and packs down.small. The mat straps are great on uneven ground.

Rock+Run Sleeping Bags

Ethically sourced Polish goose and duck down, combined with lightweight technical fabrics for exceptional warmth, weight and durability.