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Regardless of the conditions - a cool morning or a hot afternoon - the material reacts to changes in temperature , providing a feeling of freshness and comfort. HygroDiffuser® technology with VectorSphere® is a special construction using three-dimensional knitted channels that create air pockets . When it's cold, they retain heat close to the body, and when the temperature rises, they accelerate the wicking of sweat, activating the cooling effect. The fabric adheres perfectly to the body, not restricting movement, which makes running even more comfortable.