SKU: SS23758 Weighs: 685g (Regular) Comfort Limit: Not Quoted Insulation Type: Synthetic Zip Length: Short Zip Zip Position: Centre Zip Type: Mummy 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 sleepi… Mountain Core 250 Synthetic Sleeping Bag