Montbell Warm Up Sheet Review

A lightweight mesh sleeping bag liner

After purchasing my lovely new Nanga sleeping bag last year I decided the best way to keep it in pristine condition was to pair it with an inner sheet. Sleeping bag liners are an ideal way to add a little extra warmth to your sleeping bag while ensuring your bag remains free of dirt and other contaminants. I had previous experience using a silk liner though required special care including washing in soap and couldn’t be dried in direct sunlight. After a bit of research I stumbled upon the Montbell Warm Up Sheet. This durable inner sheet is made from a soft thermal Climaplus mesh designed to trap air and wick moisture away.

The Montbell Warm Up Sheet has a tapered rectangular shape providing ample shoulder room and fits snuggly inside my sleeping bag. On cold nights a drawcord allows it to be drawn tight around the neck helping you retain heat. In my experience the Montbell Warm Up Sheet is likely to add somewhere in the vicinity of 4-6 degrees to your bag. The sheet including compression sack weighs in at a respectable 205g (8.8 oz.). In a pinch I could foreseeable see using the sheet as a stand-alone sleeping system on mid-summer evenings. Overall I have been impressed by this light weight and compact inner sheet from Montbell and is definitely worth checking out.


A well tapered design with integrated draw string keeps helps deliver additional warmth extending your bag’s comfort zone.

  Montbell Warm Up Sheet: Specs

Weight including compression sack: 205g (8.8 oz.)
Fabric: Climaplus thermal mesh
Size: 183.6cm × 77cm (98.5″ x 37″)
Compressed size: 9cm x 15.5cm (3.5″ x 6.1″)
Country of origin: Japan
Montbell Warm Up Sheet No. #1121583: ($42 USD) (as at Mar 6, 2014)


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