How to use: Simply pull this track jacket on and zip it up to your desired level using the quarter - zip. You can wear it over a T - shirt on a mild day. Attention: Avoid sharp objects that could tear the fabric. Don't over - stretch the elastic parts. Maintenance: Machine wash it in cold water on a gentle cycle. Hang it to dry to keep its shape. Don't use bleach or fabric softeners as they may damage the fabric.