They are lined with a lining. This is a weaker layer of fabric under the upper fabric. The lining contributes to the durability of the swimsuit and swimsuits are not transparent after soaking. This is especially true for swimwear of lighter and white color. The only disadvantage of the lining is that swimsuits will dry longer. Swimwear provides an advanced level of compression that ensures maximum support fo body and its stability. The horizontal carbon fibers provide the greatest possible compression at the right moment, ensuring the stability of the centre of the body and maintaining maximum freedom of movement. These racing swimsuits have no classic glued seams on each sides, which creates a feeling of greater comfort and freedom of movement. They have only one glued seam on the back which ensures better fit to the body and also more comfortable feeling while dressing it up. This will give you the feeling of ,,second skin". One of the other advantages of this design is the lower water absorption and also the hydrodynamic effect, thanks to the very light and fine fibers that are very tight. The swimwear have elasticated waistband for better tightening and comfortable wearing. The fastening string guarantees comfort. You can fasten the swimsuit by the string and you don't have to worry anymore that the swimsuit will fall down when you jump in the water. Approved and certified by the International Swimming Federation FINA (Fédération Internationale de Natation). It meets all international standards and allows start at prestigious races.