Topic 3:

Anatomy of the Hand:

Sweat Gland Ducts on the Top of the Hand - Approximately 200 per square Centimeter

Sweat Gland Ducts on the Palm of the Hand - Approximately 370 per square Centimeter

We have learned previously that our  hands and  feet are at the end of the supply chain for the circulating blood, which is also the major source of transferred heat that is supplied by the body.  We also learned that there can be issues that can impair or restrict the maximum flow of blood to our limbs, which can result in finding our limbs getting colder faster then the rest of our body during cold weather activities.

It is very important to understand how the hand has been naturally designed to deal with heat dissipation and perspiration, as this is one of the most critical factors as to why the “status quo” design for outdoor mittens are built to fail. (Refer to the picture)

In comparison to the hand and as a point of reference, your forehead contains an average of 175 sweat gland ducts per square centimeter, the chest, forearms and stomach have approximately 155 per square centimeter and the back and legs have approximately 60 to 80 per square centimeter.

Therefore as you can see, the hand clearly dissipates more heat and perspiration through the palm area on the hand, almost a 2 to 1 ratio greater then the top of the hand.  The Question that comes to mind at this point then, is why are the “status quo” mitts designed with only 25% to 50% of the insulation thickness on the bottom of the mitten versus the greater thickness on  the top of the mitt?

Un-Natural or "Contrived" Position

Natural Resting Hand Position

The last thing that needs to be shown in our brief overview of the Anatomy of the Hand, is what the differences are between the “normal” resting position of the hand, versus’ what is the contrived position that is required to achieve gripping with a “status quo” mitt.  We will point out here that the “contrived position” is one that forces you to exercise slight muscle tension in order to bring the finger tips together with the thumb, which over an extended period of time can cause stress and/or pain in the hand.  This becomes even more predominate when an object is being gripped for a longer period of time, like a handle bar or something else.