Zaffiro is a device emitting the infrared radiation IR of specially adjusted wavelengths resulting in uniform and gradual warming up of the deep layers of the dermis (up to 65°C) combined with a constant, protective surface cooling. The thermal effect, occurring in the lower layers of the skin causes irritation of the collagen fibres that contract rapidly to their original length. As a result, the skin is densified and tightened. Another long-term effect is the stimulation of fibroblasts to produce new collagen fibres. The collagen production is increased by about 30 percent, leading to improved skin density and lifting. The process of collagen production takes place gradually so the final effect of the skin rejuvenation is visible within 3-6 months after the treatment.