Compressport racing v21 ultralight bike socksthis sock was developed to meet a specific demand from pro tour cyclist joaquim rodriguez he wanted a dynamic elastic sock with high elasticity but also ultra light thin and with maximum ventilation compressport accepted the challenge and 2 years later the v21 ultralight was born features optimal ventilation thanks to ultra meshultra fine and lightthe 360 compression dampens the shock wave effect on muscles veins and joints buycompresspo