Swimsuit Speedo one-piece, brief or boxer swim shorts, made from chlorine and UV-resistant material: the models from a brand that comes from competitive swimming.
The swimsuit Speedo comes from competitive swimming, a world from which it has kept its standards. The brand's models are said to be chlorine and UV resistant, and its ECO+ technology claims a chlorine-resistant material combined with good support, quick drying and lasting comfort.
There are three key differences in the pool. First, the material, treated against chlorine, otherwise the elastane deteriorates in a few weeks. Next, the fit, which is snug and without excess fabric to reduce drag. Finally, the back, designed to free the shoulder blades. A beach swimsuit Speedo fails on these three points, and many pools actually prohibit swim shorts for hygiene reasons.
For women, the racerback one-piece dominates the training offerings, while the two-piece Speedo swimsuit remains marginal in the pool. For men, the swim brief is the reference cut for training, with the swim boxer for those who want more coverage without sacrificing fit.
It should fit snugly when dry. A swimsuit that feels a bit tight in the changing room will be at the right tension after a few lengths, while a swimsuit that feels comfortable when dry will become loose in the water and hinder movement.