Available in 3 size, Thermals Spas swim spas are always warm and ready to use yet demand surprisingly affordable operating costs. Full foam installation surrounding the shell-combined with the custom fit shell covers-forms an effective insulation barrier keeping the heat in and the cold out. Swim spas can form an important part of the day-to-day fitness regime of anyone who wants to stay in good shape. Offering 4 exercise stations, either swimming or rowing against the powerful built-in jets will provide an intense workout.