Scientifically proven to aid blood flow & improve performance & recovery… These are clever socks! The humble sock is not so humble after all. The compression in these socks increases the flow of deoxygenated blood back through your system which benefits cardiac output. The high stretch compression fit support muscles too. The construction is cycling specific too with Lycra support zone on the arch & a seamless toe area. High stretch component blend Tight compression fit for muscle support & enhanced circulation Lycra support zone on arch Seamless toe Twin Pack Construction Nylon 45% Lycra 32% Elastane 23%