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Thermarest Ohm 32F/0C UL (Long)

Size: Long

5The Thermarest Ohm 32 UL is featherweight, 18-ounce construction sleeping bag with a roomy, semi-rectangular shape. Ideal for fast and light adventures. 

Bringing balance to ultralight adventures the Thermarest Ohm 32 UL provides a roomy fit and offers versatility with the ability to convert into a two-person quilt. The bag uses thermally-efficient box baffled construction to ensure warmth and comfort in an ultralight package. Designed with high-quality materials and Therm-a-Rest performance features, the Ohm keeps your pack featherweight and versatile without sacrificing an ounce of performance. Compression sack and storage 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.


  • Ultralight: One of the lightest pieces in its class, the Hyperion sets a new standard for high-performance outdoor equipment.
  • 900-fill Nikwax Hydrophobic Down : Stays drier and maintains loft 60 times longer than untreated down.
  • Unrivalled Packability: Lightweight materials and precise design allow for a smaller packed size than ever before.
  • Box Baffled ConstructionUses mesh walls to maximise loft and minimise cold spots in key areas.
  • Comfort Fit: Ergonomic shape and longer zipper provide a more human-friendly fit than other ultralight bags.
  • Zoned Insulation: Maximises warmth and saves weight by intentionally placing fill where you need it most, 70% on the top and sides with 30% on the back.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.


Regular Long
Colour Larch
Weight (Standard) 1 lbs 2 oz 1 lbs 5 oz
Weight (Metric) 0.52 kg 0.61 kg
Width (Standard) 31 in 33 in
Width (Metric) 79 cm 84 cm
Length (Standard) 73 in 79 in
Length (Metric) 185 cm 201 cm
Height (Standard) 4 in 4 in
Fits (Standard) 72 in 78 in
Fits (Metric) 183 cm 198 cm
Girth, Shoulder (Standard) 62 in 66 in
Girth, Shoulder (Metric) 157 cm 168 cm
Girth, Hip (Standard) 56 in 59 in
Girth, Hip (Metric) 142 cm 150 cm
Girth, Foot box (Standard) 35 in 38 in
Girth, Foot box (Metric) 89 cm 97 cm
Packed dimension (Standard) 6 x 7 in 6 x 7 in
Packed dimension (Metric) 15 x 18 cm 15 x 18 cm
EN Comfort (C) 5 C 5 C
EN Comfort (F) 41 F 41 F
EN Limit (C) 0 C 0C
EN Limit (F) 20 F 20 F
EN Extreme (F) -9 F -9 F
EN Extreme (C) - -
Fill material 900 Fill Goose Nikwax Hydrophobic Down RDS 900 Fill Goose Nikwax Hydrophobic Down RDS
Fill weight (Standard) 12.5 oz 14 oz
Fill weight (Metric) 0.36 kg 0.40 kg
Shell fabric 10D Nylon RipStop w/ DWR 10D Nylon RipStop w/ DWR
Lining fabric 10D Nylon RipStop 10D Nylon RipStop
Zipper side Left Left

Personal Shopping - By Appointment

Would you like to try on some climbing shoes, running shoes or mountain boots for size before you make your purchase? If so, then why not book an appointment with us today! We can offer you a bespoke one-on-one shopping experience with one of our experienced staff members.

Customer Reviews

Based on 3 reviews
John K.
Summer review

Very lightweight and warm. Tested in summer conditions where night time temperature were above zero.

John Kingdom
Summer review

Very lightweight and warm. Tested in summer conditions where night time temperature were above zero.

Calling bullshit on the claim for hydrophobic down

There's marketing hype, and then there's Thermarest's claim that "900-fill Nikwax Hydrophobic Down : Stays drier and maintains loft 60 times longer than untreated down."

This is unmitigated bullshit. The premium makers like Western Mountaineering, PHD, Valandre, Feathered Friends etc are all using untreated down exclusively. This is because they have found through experience that the new treated downs don't offer any practical benefit in the field and may reduce the loft in the long-term. So it's likely slightly worse than conventional down, unless you are planning to go swimming with it...

That doesn't make this bag a bad purchase - it's great to see an ultralight offering from a mainstream brand. Just don't believe the marketing hype about the down.