Given Key Largo's 70-85 degree water temperature, you'll likely want a 3 or a 5 mm wetsuit, depending on the season. Check ahead for your planned vacation week's expected water temperature and plan accordingly.
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If you use a slow stroke rate without a wetsuit you will start to sink between strokes if you don't have great balance or buoyancy. With a wetsuit there is a lot more leniencies to swim with a slower stroke rate and keep better forward momentum.