Knitted base layer shirt

Use a neutral wool detergent, gently hand wash inside out in cold water, do not use bleach.
Lay flat to dry in the shade, iron with a cloth at low temperature.
Do not machine wash, do not soak for a long time, and avoid tumble drying or direct sunlight.
Dark colors/printed items should be washed separately, and soaking time should not exceed 20 minutes.