To match your facial expression when you're running around a bit more intensely: arm warmers made of light elastane. Because they're plain white on black, they go with any short-sleeved jersey. Including mine, of course.
To ensure that the arm warmers have as few wrinkles as possible, you should choose arm warmers that are quite tight. I (1.93 meters tall and weigh around 80 kilograms) wear "medium". There are also sizes "small" and "large".
I have been riding other models from this manufacturer for ten years and so far they have not worn out, cracked at the cuffs or pulled elastic threads.
Made in Europe.
Manufacturer information according to GPSR:
ELEVEN sportswear
Janovská 2
466 04 Jablonec nad Nisou
Czech Republic