At first glance, the 39-foot-6-inch-long, 11-foot-beam fiberglass Afina 3950 looks like a big deck boat under a glass house. Designed to stretch the season for northern-tier boaters, the concept works as well for those who boat in tropical or semitropical heat. What the maker calls the Grand View cabin can be completely closed or opened up to the environment in a variety of ways — open the forward and aft glass doors, roll down (electrically) the huge side windows, and roll back (electrically) the soft-top section. On the day we ran the Afina for a photo shoot near Jacksonville, Florida, we opened all the glass but kept the roof closed for shade, and were very comfortable on a 90-degree day and enjoyed the bright, airy house area with great views all around. Heat and air conditioning will allow the owner to further manipulate the environment for the comfort of guests in just about any season and during bouts of inclement weather.