Castelli compressione 13 socksthe castelli compressione 13 socks offer light compression for on bike or recovery use at 13cm they reach just below the calf muscle to provide long lasting compression pressure featuresmaterial 85 nylon 15 lycra light compression sock for on bike or recovery use 13cm lengthcoolmax yarns for excellent wicking reinforced toe and heel buycastelli clothingfrom chain reaction cycles the worlds largest online bike store