[pct-l] Mont-Bell sleeping bag experience?

[Peggy Rice]

Hello all,

A friend of mine is planning to buy her 16 year old son a new sleeping
bag for Christmas.  Her son hikes mostly in the Sierras, in the
summer, for up to a week at a time.

My friend's question is:  "I've stumbled across this Montbell:
http://www.hiking-camping-world.com/montbell-ul-spiral-down-hugger-1.html

Do you or your PCT list buddies know anything about this?  I like the
stretchy concept, and I think the DWR fabric is lightly water
resistant (e.g., no dew seeping in).  I'm wondering about warmth and
breathability, however."

Any comments will be appreciated!

Pegleg