You leave me behind when you walk in sand or snow. What am I?

I warm your neck when it gets cold, but I have no arms to hug with. What am I? Solve the riddle → I grow bigger every year and never shrink. What am I? Solve the riddle → What has a stem, leaves, and beautiful colors, but cannot walk? Solve the riddle → I sit on a letter and can travel far without moving myself. What am I? Solve the riddle → I have teeth but cannot eat. I make your hair neat, but I am not a hairdresser. What am I? Solve the riddle →