Here are three easy ways to say it:
- When you are cold, little bumps called goosebumps appear and your hairs stand up to help keep you warm.
- If you feel chilly, tiny bumps pop up on your skin and your hair stands up so your body can stay a bit warmer.
- When it is cold, your skin makes goosebumps and your hairs lift up to help hold warm air close to you.