HAZEL F I bought this wetsuit for my husband to use surfing in cool water on Cape Cod, it is a great wetsuit for the price and I think it would be a great choice for windsurfing too, it is very flexible and very warm. I think this is about the best wetsuit available at this price point! He has been very happy with it.
Randy S Thanks for the reply. The water gets a little cool in Northern Illinois and Southern Wisconsin this time of the year.
HAZEL F I would recommend a 4/3 for water below 65'. Have fun!