Short Shorts On The Way Back!!!

[zonneman]

This guy - look at his huge thigh muscles - is an indoor track (velodrome) cyclist. Apparently a German. He is wearing padded cycle shorts, a short sleeve shirt, and separate sleeves ('arm pieces'). In indoor cycling these are habitually worn to reduce air friction.

UCI = the International Cycling Association.
erdgas ('natural gas') is the sponsoring name of some German energy enterprise, seen in may sports, soccer among them.