OMM Mountain Core 250 Synthetic Sleeping Bag

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The Mountain Core is a synthetic sleeping bag lined with Primaloft’s ACTIVE insulation. This ultralight bag is ideal for mountain racing where weight and pack size are critical. 

OMM says: 

Like all OMM sleeping bags the Mountain Core 250 is made from a combination of materials to ensure maximum performance, the PointZero® shell, has a DWR treatment to aid water repellency and Primaloft® ACTIVE insulation warm when wet technology.
Utilising the soft textured Primaloft® 250gsm ACTIVE fleece insulation on the inside increases wicking and improves comfort.

Our Verdict

OMM’s Mountain Core 250 Synthetic Sleeping Bag uses a unique combination of Primaloft Active insulation and PointZero outer fabric. With this combination you are getting insulation with an excellent warmth to weight ratio and a highly wind resistant outer fabric. This sleeping bag is ideally suited to mountain marathons where weight, pack size and efficiency are key. In reality it is a summer bag but you can always extend its use by wearing more clothes during colder conditions. 

Primaloft is the leading synthetic insulation in the outdoor world and its use guarantees you are getting the maximum insulation value for the minimum synthetic weight. The Pimaloft Active used in this bag is used across OMM’s Core range, usually for active insulation where breathability and moisture management are key. This bag certainly isn’t aimed at being the warmest but the users it is aimed at are probably not too concerned by that. Down bags are of course warmer for a given weight but some people prefer the synthetic bags because of their durability and wet weather performance, particularly if you use a bivy or sleep under a tarp regularly.

– Reviewed by Ultralight Outdoor Gear

Features

• Soft textured Primaloft® ACTIVE insulation
• Continues to insulate even if wet
• Half YKK® zip
• Stitched through inner with loose laid outer
• Fast drying easy care
• Hood drawcord
• Hang loops at base

Specifications

• Weight: 685g
• Standard Fit
• 195cm long mummy shape
• Shoulder Width 65cm
• Pack Size – 27 x 16cm

Material & Construction

• PointZero® – 100% 22gsm nylon ripstop fabric, downproof, highly wind resistant with DWR
• Primaloft® ACTIVE 250g
• 100% Recycled Insulation
• Insulation rating DRY – 2.0 TOG
• Insulation rating WET – 1.4 TOG

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags 
• Time-Saver Guide to Choosing a Sleeping Bag
• The EN13537 Standard
• OMM Core Technology Explained