Preshrunk doesn't mean that it won't shrink any more. There are three elements that aid in the shrinking process – moisture, heat, and agitation. These elements can cause the strips of fabric to constrict, making the weave of a garment tighter, ultimately reducing its size.

Are pre shrunk shirts smaller?

The result: no change in size. That's because, these days, most shirts come pre-shrunk. If you do want to shrink down a shirt, it's going to be a lot harder than you think, especially if it's cotton. Most cotton shirts, not pre-shrunk, will only shrink about 20% from its original size.

Can you put pre shrunk cotton in the dryer?

Preshrunk cotton will not have as strong a reaction, but in general, you should keep all-cotton garments away from high heat. The abrupt temperature change and rapid drying process inside a dryer can cause cotton to shrink a lot more than just washing the material in hot water!