We have, and we'd like to share! A CLO is unit of measure for clothing warmth developed in 1941. One CLO is the insulating value of a man’s business attire (suit, shirt, underclothes, socks and shoes). Regular indoor comfort range at a temperature of 65 to 68 degrees is 1.6 to 2 CLO’s when sitting or resting; 1.2 to 1.5 CLO’s when you are doing light work or .5 to .7 CLO’s when you are moving around; interesting, right?

The key to keeping warm is to put layers of still air between you and the cold; winter jackets keep you warm because the fibers create pockets that trap air which is then warmed by your body. Zero CLO is the beginning of the scale, which is basically wearing nothing; while 4 CLO is the highest CLO ranking. At level 4 a person would be wearing (as an example) fur pants, an insulated winter coat, hood, gloves, etc. Soooo, the higher the CLO value, the warmer you will be; high CLO means high thermal resistance and good insulation. Hanna’s Thermolite jackets, for example, are 180 gm Thermolite which is rated at a 2.5 to 2.8 CLO.

It’s great to be able to carry a variety of jackets with different kinds of insulation because kid’s activity levels vary so much. Our Reversible Down jacket and Vest, and our Satin Puffer jacket are our warmest coats, as down insulation has been rated the warmest thermal conductor; extremely comparable in warmth are all of our jackets which have the 180g Thermolite Plus insulation such as our Snowsuit, Journey’s End jacket, and Winter Bibs as well as our Polartec Wind Pro jacket; and rounding out our cozy warm selections would be all of our jackets which have the Sherpa or Fleece linings including the Explorer’s Pea Coat, the Round Trip jacket, Seven days a week jacket and the Expedition jacket.

Ok, maybe this is more than anyone might want to know about CLO, but we hope it helps in the quest for winter warmth!

Thanks for providing all the details. I recently purchased the Reversible Down jacket for my 3-year-old, and wonder whether you would recommend either the Hanna snow pants or winter bib for my son to keep him warm during the New England winter season. Thanks in advance. I'd like to purchase one of them before the sale ends.

Are you going to share the CLO numbers for all your outerwear? That would be sooooo helpful. Thanks!

Thanks Michelle, either one would be a great selection; they are both made with the Thermolite Plus insulation which is a cozy, warm choice for a New England winter!