3D Bionic Sphere (R) system on chest, back and lower back panels. Air-Conditioning Channel (R) ventilation system . Air Guides (R) aid the Air-Conditioning Channel (R) system in circulating air. AirComplex-Zone protects the solar plexus. ISO-Shoulder (TM) guards against chills . SweatTraps (R) wick sweat away to leave a dry feeling. Extended ExpansionRibs (TM) protect elbows from the cold . Made in Italy . Size S = S/M . Size L = L/XL