With the weather getting colder, “walls of kindness” where people leave unwanted clothes are popping up all over Iran in an attempt to keep the homeless warm this winter.

These spontaneous outdoor charities are based on a simple principal: “If you don't need it, leave it. If you need it, take it."

All over the country people are leaving unwanted clothing items on designated walls with hooks and hangers.

A wall of kindness in East Azerbaijan’s city of Mianeh

As the weather gets colder, the drive is picking up momentum with pictures of such charities from all over the country being posted on social media.

A wall of kindness in a village in Iran’s North Khorasan Province

A wall of kindness in Iran’s western province of Kermanshah