First let me just tell you that I pulled out my original headlamp for yesteryear and boy have times changed!

The Princeton Scout (small headlamp in foreground) I've had and use on my entire JMT (32 days no battery change)

The Princeton Tec Scout weighs 1.4 oz (40 g) with its 4x2032 coin cell batteries. It is a 2-LED headlamp with the battery housing in the front (same compartment as the lamp housing). The headband is a single strap, wrap-style with 3/4" elastic webbing.

The Princeton Tec Scout offers three brightness modes ('high', 'medium', and 'low') plus two blinking strobe modes (30 Hz, 120 Hz). Modes are toggled with a single push-button switch, designed to be pushed with your index finger while your thumb and index finger 'pinch' the lamp housing.While with heavy gloves it can be a challenge to work the little button,  thin gloves worked fine for me.

What I really like about this headlamp aside from its small size is the fact that the on/off button when stowed properly can not get mistakenly engaged on.  So you never have to worry about dead batteries. Its also nice and small, fits into the palm of your hand.

This headlamp is a great compact and light weight item. Great for the ultra-light backpacker. After 32 nights of consecutive use it still had enough power for summiting Mt Whitney at 1:00am, working 5 hours getting me to the top from Trail Camp. That is a winner!  As was the sunrise that morning at the end of a very long and amazing JMT adventure!  (smile)
 

The Omni-Heat® is one of Columbia's trademark fabrics. I have two of there winter hats that feature this technology. I've used both hats in varying climates and both have stepped up big time with the added warmth factor.
My beanie I used 30 days consecutively in the Eastern Sierra's with temps as low as 22°. My Trapper Hat I use on all snow backpacking trips. Temperatures varying from 50° - 0°. What makes these hats and this technology work so well for me is that I never over heat,  but it really does keep the heat in when I am being active on the trail and not just sitting at camp.
About Omni-Heat:
The Omni-Heat® thermal reflective interior adds more warmth without adding bulk by using reflective fabrication to capturing and retaining your body heat.

The little kid in me loves the look and styling of both these hats. The adult in me appreciates the warmth factor in the technology. Its a win win for both of me. (smiling)

I'm a huge fan of comfort and the outdoors! As a girl who loves backpacking in all weather, keeping my feet warm is essential! I'm never without a pair of Acorn socks. Pair these socks with your favorite down booties and your feet will be forever warm in all environments. Even snow!

• Polyester fleece breathes and wicks moisture away from skin
• Two-way stretch and flatlock seams enhance comfort

The best part girls,  they are available in all sorts of fun colors.