Taking care of a DULO performance shirt or polo is veeery simple :)
Every DULO shirt is machine-washable. Make sure you set the temperature to warm (40 degrees Celsius or around 104 Fahrenheit), or below.
Once the washing is done, do not tumble dry. Just take the shirt out and hang to dry. Wear directly. Once you put it on, body heat will warm the fabric and straighten itself out (no ironing!). Your shirt will only look better as the day goes on ;)
Wash it, hang it, wear it.