Berlin trainers double up as metro tickets
Dozens of people camped out overnight in the German capital in the hope of buying a pair of trainers that allows free travel on Berlin's metro.
Each pair of trainers sold by Adidas has an annual metro ticket worth €730 (£650/$895) sewn into its tongue.
The sportswear company was selling 500 pairs of the limited edition shoes for just €180.
They have been launched to commemorate the 90th anniversary of Berlin's public transport company.
There was a clamour for the shoes both at Adidas stores in Berlin and on the black market.
Nikita Dutschenko, a young man who camped out in sub-zero conditions and missed school to buy the shoes to sell on, told Reuters: "I already have a buyer who will pay 850 euros."
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The chairwomen of Berlin's public transport company, the Berliner Verkehrsbetriebe (BVG), said that the collaboration with Adidas was "cool".
"It's great that the BVG is now becoming a style icon itself," Sigrid Nikutta said.
One Twitter user joked he had found a way to mimic the trend by sticking his ticket in his shoe.
It is not the first time a sports company has worked together with a transport authority.
Adidas' competitor, Nike, made several designs of trainers with Tube lines in collaboration with Transport for London to mark the Tube's 150th anniversary in 2013.