If you are looking for a top quality changing poncho dry robe then take a look at the Moonwrap waterproof poncho from Frostfire.
Everything abut this robe is excellent and well thought out, offering all the features you would find on a £140-£150 dry robe.
The Moonwrap comes in 3 adult sizes which are long sleeve and 2 kids sizes that are mid length sleeves.
Navy Blue with Grey fleece inner
Medium, Large & XL