Actually not just one, but two Omni-Heat base-layer tops rocked up from Columbia the other day, a long-sleeved, half-zip version - coincidentally our favourite base-layer style - and a matching Mock Neck LS version. Both of them are Columbia

Just in is one of the most unusual base layer tops we've come across, Columbia's Omni-Heat Heavy Weight Long Sleeve Top complete with innovative reflective inner surface.Shiny On The Inside...From the outside it looks like a perfectly normal

The print on the inside of the collar of Columbia's Omni Heat Heavy Weight Long Sleeve Top reads 'Make Your Own Heat' and that, in a nut-shell, is what it's all about.On the outside it looks normal enough, but on the inside, Omni Heat fabric

Just arrived is Columbia's new for winter 2012 Powerfly Down Jacket, a lightweight winter insulation top  that uses the brand's Omni-Heat thermal reflective lining to increase warmth, it's claimed, by some 20%.From the outside it looks like any

is crammed with proprietary technologies, in this case Outdry, Omni-Heat and an Omni-Grip outsole. If you're cynical you might think that Columbia just adds an 'Omni' to a convenient descriptive word and calls it it's own - what price Omni-Lace or Omni

-Dry and, of course, 'non-Omni' OutDry for starters.Technology CrazyThe brand is technology crazy. Which other major outdoors company would produce a base-layer top with a silvery, reflective inner surface to radiate heat back to the user? It's gear geek

weather performance and a precision simmer control. It also comes with a heat reflector.It isn't a full-in expedition stove like the new OmniFuel Ti we recently reported on, but it could be an interesting half-way house giving you the option of burning