Cowboys linebacker Jaylon Smith sported a pair of Puerto Rican flag cleats before Sunday’s game in San Francisco, for a good cause.

The red, white and blue cleats will be auctioned off to benefit the Salvation Army’s Emergency Disaster Services, Smith tweeted Sunday.

At least 49 were left dead as Hurricane Maria devastated Puerto Rico last month. Even a month after the storm, a majority of the island was still without power.