Is that -25F or 25F?

A medium quality synthetic Mummy bag weighing in at 2.1Kg will have a comfort rating of -4C (25F) rather than -32C (-25F)

I recently purchased a PHDesign Mimum 500 sleeping bag rated at -10C comfort (EN 13537 standard) using certified 900 Down and MX water resist outer fabric, which I got on sale just before Christmas saving aroung $150 off the retail price. A very warm Sub Kg Winter bag. It wasn't as compact as I hoped for due to the extreme fluffiness getting it into an Event Stuff sack.

https://en.wikipedia.org/wiki/EN_13537

The Snugpak rating of comfort -7C for the Travelpak 4 will also be to the EN 13537.
http://www.snugpak.com/outdoor/travelpak-4

The Military spec Softie 10 bag will be better than the Travelpak-4. Its the Milspec Softie range of bags that Snugpak has built its reputation on.

http://www.snugpak.com/military/military-sleeping-bags/softie-10-harrier-sleeping-bag