Why do runners wear arm sleeves?

The Great North Run 2023 is taking place with many runners having taken to the route with arm sleeves on - but what purpose do they serve?

Running Arm Sleeves - Why do runners wear arm sleeves?

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Do Compression Sleeves Work? The Science + 4 Recommended Sleeves

WHY ATHLETES WEAR ARM SLEEVES - SKINS Compression USA

Why Do Athletes Wear Compression Sleeves?

Why do runners wear arm sleeves? - Quora

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Do Compression Sleeves Work? The Science + 4 Recommended Sleeves

Why Do Runners Wear Arm Sleeves? 9 Solid Reasons We Do

Why do runners prefer the arm sleeves over just wearing long