Swiss Tech 3-in-1 Jacket System. We LOVED this coat. Either piece can be worn separately or zipped together to be one thicker jacket. The sleeves and neck have Velcro tabs, and zipper system makes it very easy to get on and off when both pieces are worn together, unlike other jacket “systems.” The outer layer is waterproof and inner layer is soft and warm. Marked 4T on one jacket, 5T on the other but purchased together, this coat fits like a 5T. It was worn daily but held up really nicely. There’s a stain on the hood that I haven’t tried to get out.