Will a shirt shrink In a pool if it says use non chlorine bleach?

A shirt that indicates it can use non-chlorine bleach is likely made from materials that are less susceptible to damage from chlorine. However, swimming in a pool can still cause some shrinkage, particularly if the shirt is made of cotton or similar fibers, as the heat from the sun and the chemicals in the pool can affect the fabric. To minimize shrinkage, it's best to rinse the shirt with fresh water after swimming and avoid prolonged exposure to pool chemicals.