Polyester fleece will shrink when exposed to temperatures greater than 155 degrees. If fleece polyester is exposed to temperatures greater than 180 degrees, it can cause permanent damage to the fabric. To avoid shrinking polyester fleece, avoid drying on high heat or washing using hot water.

Does 100% polyester shrink?

Polyester does not shrink under normal circumstances. Because polyester is made of man-made polymer, which makes the fibers synthetic, the fabric is resistant to shrinkage. If you wash polyester fabric in hot water and then dry it on high heat, it may shrink some, but not a whole lot.

Does fleece shrink in the dryer?

Also, it will depend on how hot you set your dryer. High temperatures tend to shrink even shrink-proof fleece. If the blanket is made from 100% cotton, then expect it to shrink 1/4 size down after a trip through the washer and dryer.