The Nike HydraStrong is a highly durable material that provides long-lasting comfort and performance. The composition of this material is 53% polyester and 47% PBT. This fabric makes the swimsuit resistant to chlorine, sunlight and salt water. It is a very flexible material that will allow you maximum range of motion during wimming. The swimsuit is well breathable and quick-drying. 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. Swimsuits have a medium cut. (Medium Leg) This swimsuit has a Muscleback style back. This cut is typical for training swimwear as it provides an optimal range of motion when swimming.