Lesson 7 — Activity 3: Keeping Yourself Warm
Lesson 7 — Activity 3: Keeping Yourself Warm
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The same techniques that keep a house warm also keep our bodies warm. You will learn about this aspect in this activity.

Dressing for the Cold
On cold days, it's best to wear several layers — clothing like a T-shirt, long-sleeved shirt, sweater, pants, and jacket. Choose clothing for the inner layers with open weaves and thickness. Air trapped in the material will serve as insulation. A windproof outer layer will keep warm air from escaping.
Some of the warmest winter clothes contain down. Birds grow fluffy down feathers under the feathers that can be seen. These feathers keep birds warm. Down is often quilted between the outer shell and inner lining of a vest or jacket. When down is fluffed, it holds air in place. The jacket material keeps air from blowing through the down and changing cold air for warm.

Remember that a dry body is a warm body. If you are engaging in any vigorous activity, you will sweat. When working or playing outside, you want to protect yourself from getting and staying damp. When you start to sweat, remove one layer, then possibly another. This will allow heat to transfer out and your body to stay at the right temperature. Then as soon as you stop moving, replace those layers of clothing.
The Inuit peoples who live in northern Canada wear clothes like the ones
in the images below and on the right. On very cold days, two complete suits are
worn. The inner set is worn with fur next to the body. Body moisture is transferred through the fur and through the leather skin.
Caribou fur is dense and the individual hairs are hollow. Air trapped between and inside the hair
provides insulation. The outer parka is worn with the fur outside. This
is very important on very cold days. The parka hood traps air in front of the wearer’s face. Frigid air is warmed before being breathed, and this protects the wearer’s lungs.


During extreme cold weather, water vapour from the lungs might condense and freeze on people’s faces and clothing. Inuit hoods are designed to prevent condensation. The edge of the hood, where ice might form, is trimmed with wolverine, wolf, or some dog fur, which ice does not stick to.
Keeping Cool
Did you know that people in hot areas actually wear many clothes, not few? They do this to minimize heat transfer. Long, thick robes protect their bodies from the rays of the sun. Light-coloured clothes reflect heat from the environment and allow body heat to escape.
Digging Deeper
Some jobs require workers to dress for extreme hot or cold conditions. One profession like this is a firefighter.
Firefighters’ suits are made of a special material. Many suits contain flame retardant chemicals. When sparks or flames come into contact with the suit, the fabric chars but does not burn. The charred material produces a layer of insulation that protects the firefighter from too much heat.
Firefighters can also suffer from heat stroke if their body temperatures increase too much. Material on the inside of their fire suits absorb their body moisture. This helps to keep the firefighters cool.
The fabrics used in firefighters’ suits are tested to determine their fire-resistant qualities. Scientists conduct tests by dressing a mannequin in fire gear and setting it on fire.