Wetsuit - equipment that protects the swimmer from hypothermia and skin injuries. The wetsuit is used for a variety of water sports including spearfishing, diving, freediving, windsurfing and diving.
You should choose a wetsuit with a mandatory fitting. It should be exactly the right size and fit snugly to the body, like a second skin. In a suit that is too loose, heat is poorly retained; in a suit that is too tight, it will be difficult to breathe, which will lead to rapid fatigue of the swimmer.
In this case, you can be guided by the following criteria:
neck area - the suit should fit snugly, but not pinch;
armpits - small gaps are allowed;
perineum - tight fit;
lower back - loose fit, taking into account the curvature of the spine;
ankles and wrists - a snug fit (most often water gets in through them).