Kharon
Contributor
In Lake George upstate NY (way farther north than TN and spring fed) I layer depending on depth (thermoclines down to upper 40's) and conditions up top. I have 2 Henderson polyoleofin (neutral buoyancy) full suits (2mm insulation), a 3mm vest and a 3mm wetsuit (well fitted). I mix and match as needed and don't get cold. That said - I don't need more than a rash guard on Bonaire (79°F water)