Imagine you are stranded on a mountainside in cold, dry, windy weather. You can choose a jacket made from one of the fabrics in front of you.

This is what you have to find out:

Which fabric would keep you warm?

You can use any of the things in front of you. Choose whatever you need to answer the question.

You can:

• use a can instead of a person

• put warm water inside to make it more lifelike

• make it a "jacket" from the material

• use a hairdryer to make imitation wind (without the heater switched on of course)

Make a clear record of your results so that another person can understand what you have found out.