The sleeveless PRO Tech SIXS has all the characteristics of moisture management Chiefs UNDERwear SIXS, with the addition of the preparation for the innovative d3o protections and SAS-Tec. The clothing approved for trial competitions, thanks to the certification CE EN 1621-2 Security PRO BACK. Leveraging Technology SIXS original carbon underwear ® allows you to preserve the skin from sweat and provide you with maximum comfort and sporty performance. Seamless design for more comfort. To be used without any underwear - a feature of the whole line PRO Tech. Designed for sports where collisions are the order of the day, it becomes necessary to combine the comfort of dry skin to the assurance of being protected. It is the free version of the most complete protection of the chest PRO SMX. It is used on snow, bike, horseback and being available in sizes from 4 years also on skateboards, skates, etc.. There are also versions SM2 PRO S (specifically designed for snowboarding and freestyle) and PRO SM9 S that you are wearing a jacket.