Sponge fleece is a fabric that is a blend of cotton and polyester. It is a soft and warm material that is often used to make sweatshirts, hoodies, and other cozy clothing items. Sponge fleece is made with a 3-end fleece, which means that it has three threads woven together to create a thicker, more durable fabric. It is a popular choice for clothing because it is comfortable, easy to care for, and has a more form-fitting cut. Sponge fleece is also known for being eco-friendly, as it is often made in a dye house that uses sustainable practices. Overall, sponge fleece is a cozy and comfortable fabric that is perfect for lounging around or staying warm on a chilly day.