The initiative began this week.
During their free time, U-High students signed the banner offering words of support to the affected families.
The tragic events last Friday hit home for some.
Sophomore Martin Coughlin says he held his fifth grade sister tighter than ever when he saw her that night.
"That day after school I went home and hugged my sister," said Coughlin. "It was nice to see her, because it could have been her you know?"
"This is a way to let it out and make yourself feel like it's going to be okay," added Senior Annie Showers.
This week U-High students also wore Sandy Hook Elementary School colors of green and white.
They're mailing the banner there Friday.