This is a soft, thin flannel shirt from AZUL by moussy. It has a red and white check pattern and is convenient for layering or as an inner layer under sweatshirts, hoodies, etc. The sleeves can also be rolled up. The size is S, but it's a bit oversized. The sleeves are about 3/4 length. It's a long shirt that can also be worn as a light jacket. I've worn it a few times. It's great for this time of year, either worn alone or layered.