Treat stains before washing. Pour laundry detergent directly on a stain or problem area and rub the fabric together. Let soap set for a minute, then rinse under cold water.
Wash T-shirts in the washing machine with cold water on the regular cycle. Avoid hot and warm water altogether.
Dry T-shirts outdoors on a clothesline on cool or warm days. Avoiding the tumble dryer and its excessive heat will help keep your shirts intact.
Dry T-shirts on a hanger indoors. On very hot and sunny days, the heat will shrink the fabric, so simply place them on clothes hangers and let them dry in the house.
Iron T-shirts only after the shirt is completely dry. Heat exposed to a wet T-Shirt will shrink the fabric, so iron after the drying process is finished.