October 30, 2017

When working in cold environments, it can be difficult to accurately estimate how much warmth and insulation are needed based on just the temperature alone.

And how do you compare insulation when there are different brands and levels? There’s a lot of information out there, so understanding the science behind CLOs can help you navigate Thinsulate™ and other cold weather protection liners.

What is the CLO Rating System?

This system is used to measure the warmth levels of various materials. It’s determined based on the insulation levels needed to keep a person at a comfortable level while standing in a 70-degree room at 50 percent humidity. The base is 0, which represents a completely unclothed person.

Example CLO ratings of garments:

  • Men’s briefs = .04 CLO
  • Sweatpants = .28 CLO
  • Thick Sweater = .35 CLO
  • Winter Coat = .70 CLO

Now, compare those to some of the most common thermal liners used in cold weather hand protection, like Thinsulate™ :

  • C40 Thinsulate™ = 0.7 CLO
  • C100 Thinsulate™ = 1.3 CLO

When looking for cold weather PPE, beware of gloves and other products that give temperature or CLO ratings as "guarantees". Many factors play into body temperature, and one single solution can't guarantee the same results for every worker!

Contact a HexArmor Solutions Specialist for more information on our cold weather work glove solutions and what product may be the best for you and your application.