Dryrobes also have a waterproof and windproof exterior. According to DD, who went swimming last weekend in a water temperature of 8.2 degrees, you do not feel cold until you get out of the water and you immediately need to get something over you that is warm, drying and waterproof, then you have a hot drink to start warming you from the inside, before getting dressed, under your robe.
DD has a very good system, once she has had her drink, she gets in the car aand drives to the local sports club and sits in the steam room for half an hour, then gets dressed and goes home.