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.
because that way it keeps us from the sun and light
Fats
A blanket keeps you warm by containing your body heat, under the blanket, so that your body temperature stays comfortable. It also keeps the colder air from contacting your skin. A blanket creates a air barrier around you and insulates that area. Just like wool socks and thermal underwear, it keeps wind from removing the heat that is trapped there. Wind removes heat faster than most things. To see an example, take an ice cube and place it on a plate, take another and place it on a plate in front of a fan. The ice cube in front of the fan will melt faster because the ambient air is removed. A tent or an igloo serve the same purpose by creating a still air mass.