Most people get cold either in their feet or their torso when temps. dip below the rating of their conventional bag.  The former need only take the foot section of their MOB Regulator in such conditions; the latter only the upper section.  If your operating location indicates 40° lows with potential "snaps" to 30, and you get cold around the torso if that happens, all you need is a 40 ° MOB upper (more on the ratings of our three MOB set-ups below).  This is why we are making the MOB available in increments, or as a complete, sectional bag.
 
     
 

MODULAR OVER BAG AS LAYERS
farenheit black / celsius green

MOB
ON THE 20° BASE BAG
ON THE 40° BASE BAG
+ 40° MOB (+4 celsius)
(25 DEG ENHANCEMENT)

brings the combo down to
- 5° ( - 21 C )

brings the combo to 15° ( - 9C )
+ 20° MOB (- 7 celsius)
(45 DEG ENHANCEMENT)
brings the combo to
- 25° ( - 32 C )
brings the combo to -( - 21C )
0° MOB (32 celsius)
(55 DEG ENHANCEMENT)
brings the combo to
- 35 ° ( - ? C )
brings the combo to - 15 ° ( ?1C )
- 20° MOB (- 29 celsius)
(70 DEG ENHANCEMENT)
brings the combo to
- 50° ( - 46C )
brings the combo to - 30° ( - 34C )

Please note: temperatures stated are approximate, and will vary slightly with individual's metabolism, clothing and cold tolerance.