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Arm sleeves are sized by arm circumference. Ask us for measurements of this exact piece if you need help choosing.
Listed size: S
On 1 January 2026 the NN Running Team became the dsm-firmenich Running Team. The announcement came four days later, on 5 January, and it named three things at once: dsm-firmenich as title partner, NN Group staying on in a new role as founding partner, and Huawei arriving as technology partner. The one line in that release that matters to anyone who collects kit was the one that changed nothing — “NIKE Remains Main Partner and Team Supplier”, unbroken since the team launched in April 2017.
dsm-firmenich is a Dutch-Swiss company formed by the merger of Royal DSM and Firmenich, completed on 9 May 2023, listed on Euronext Amsterdam as DSFIR, with double headquarters in Maastricht and Kaiseraugst and around 30,000 employees. It makes ingredients: perfumery and beauty, health and nutrition, taste and texture.
Arm sleeves are removable knit tubes from bicep to wrist that give runners adjustable warmth at cool starts, UPF sun protection, light compression and — worn singly — a sprint signature. They are the most modular piece in the race kit.
Their origin is basketball: Allen Iverson's trainer cut a compression stockinette for his elbow in January 2001, Iverson scored 51 that night, and the sleeve became a league staple before crossing to marathon start lines and single-armed sprinters.
The jobs are plural: warmth without a jacket, sun protection in UPF-rated versions that block around 98% of UV, light compression, and — not to be underrated — identity. A sleeve is the cheapest way a kit says something personal inside a federation uniform.
A pair weighs less than an energy gel, which is exactly why the cold-start calculus favours them.