The most popular fiber in the world.

Cotton can be machine or handwashed. To prevent garments from shrinking and to keep them looking their best, wash at 30°.

Check the label to see if machine washing, hand washing, or dry cleaning is best. If machine, use the appropriate wash cycle. 
Wash in warm or cool water to prevent shrinking and fading. Use hot water carefully, as washing cotton in hot water can cause it to shrink.

Cotton fabrics can be air-dried or machine dried using moderate-to-low heat. High heats can cause cotton fibers to shrink.

Iron on high heat while fabric is slightly damp. Use steam as needed. Note that ironing can usually be avoided by air drying or removing immediately from the machine.