The design is very nice but as a pajama it doesn't make sense. I mean, the sweatshirt is lightweight and the pants are very thin leggings. So, you can't really call it a winter set. Also, the sweatshirt is filled with fuzz as mentioned in another comment, which is very accurate

They look nice aesthetically. However, the leggings are made of quite thin fabric, I would prefer them to be a bit thicker for a winter pajama. The top is made of thin fleece with fleece lining, but it shed blue fluff everywhere. Even after 3 washes, it still sheds. Poor quality, I expected much better from Minerva and for their price.