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Calf warmers are sized by calf circumference. Ask us for measurements of this exact piece if you need help choosing.
Listed size: XS, S
Every cycle has a headline athlete; 2023's wrote hers in seven weeks. Between 2 June and 21 July, Faith Kipyegon — a Nike athlete since her teens — broke three world records in 49 days, all of them at Diamond League meetings in her own race kit: Florence, Paris, Monaco. In September she closed the circuit by winning the Diamond League final in Eugene in 3:50.72.
The roads belonged to a 23-year-old in Nike shoes. On 23 April Kelvin Kiptum won London in 2:01:25, a course record sixteen seconds outside the world record, with Geoffrey Kamworor of the NN Running Team second in 2:04:23; the same morning Sifan Hassan — Nike — won her marathon debut in 2:18:33 after stopping to stretch a leg at the hour mark.
Calf warmers and calf sleeves are footless tubes worn from ankle to knee. Warmers are loose thermal knits for keeping calves warm before racing; compression sleeves apply graduated pressure — typically 20–30 mmHg, tightest at the ankle — and are worn through races and recovery.
The science splits cleanly: no measurable performance gain across 51 studies, but moderate, real recovery benefits. Paula Radcliffe — who raced Berlin 2011 in calf sleeves — made the look part of distance running; team-issued warmers made it part of the kit.