Story highlights "Walls of kindness" have been set up in Iran to allow people to donate clothes to the homeless

Sharing the outdoor charity drive on social media, the practice has spread across Iran

A similar initiative with fridges offers free food to the homeless

(CNN) Looking for something to restore your faith in humanity? This might just do the trick.

As Iran endures a cold winter, locals have devised an innovative scheme to help the homeless keep warm.

Spontaneous "walls of kindness," on which people can donate unwanted clothing, have popped up around the country.

The message is simple: "If you don't need it, leave it. If you need it, take it" -- next to several empty hooks and hangers.

According to government officials , there are 15,000 homeless people in Iran. Of these, one third are women. However, unofficial estimates put this figure much higher. Last year, Tehran municipality's Welfare Organization estimated that there are more than that number on the capital's streets alone.