Because it traps the heat that comes from your body from escaping, so you have more heat so it keeps you warm.
House
Heat is trapped in the atmosphere (the greenhouse effect) and this keeps us warm. So does a blanket.
Woolen clothes keeps people warm in winters because the air gets trapped inside. People have been wearing woolen clothing for years in the winter months.
keeps ur heat in x
Winter Kept Us Warm was created in 1965.
The duration of Winter Kept Us Warm is 1.35 hours.
It helps you keep warm but not by giving you heat (thermal energy). You give the blanket heat and it helps keep your heat in. This is also true among other warm things you wear or use when you need to keep warm like coats,blankets,sweaters,etc...
The Sun
keeps us warm by maintaining body temperature.
Fats
it doesn't it keeps you cool! <<< i got a cotton sweater. lol It keeps me warm :P
because that way it keeps us from the sun and light