As written in Barcelona’s El Periodico magazine:
 

Zinetic Pocket Slippers

Here is a dream for all backpackers – a shoe that is very comfortable, lightweight, breathable, and resistant to water. It fits it your pocket! This shoe has a trick. The Pocket Slippers (www.pocketslippers.com) commercialized by the company Zinetic, costs 18 Euros. They roll up from the toe to the heel. Welcome to the era of ultralight adventures!