The size is labeled as 12-18m, 80cm, but it was a slim fit. My child is of average build (though a little chubby at this time), and it seemed too tight when I wanted to put it on, so it was only tried on. I thought it might fit around size 70, so I listed it as size 70. Photos 5-7 are of the inside, flipped over. The arms are lined with fleece. The stomach and back are made of a fluffy material. I think it would probably be too hot indoors, so it's recommended for wearing outdoors in winter. This is a cute outfit with the Brannan Bear! Because of the thickness, I plan to compress it slightly and ship it via Yu-Packet Post.