Xtra is typically a night club that is for a couple nights each year turned into a Roller Skating rink for Rollerdisco evenings. Thus, the space for roller skating is small and the floor is not flat and smooth. But, you can't be picky when their are no roller skating rinks to be found in Switzerland.
Be sure to come early when doors open at 10pm, because if you don't have your own skates to bring, they most likely will run out of the popular sizes. For 25 CHF and a personal ID (be sure to keep the paper number in order to pick your ID back up at the end), you get a pair of quad skates and the ability to skate your heart away for the evening to music played by DJ's from across multiple generations, so if you are a hater of the 70's Disco era, do not fear, because they only played a couple of songs from that genre.
Once you have obtained your skates, you can rent a blue Ikea bag for 5 CHF to put all your personal belongings in and have stored (be sure yet again to not loose the paper number).
Once you have successfully put on your skates, be prepared to climb some stairs in order to gain access to the "rink" area. There is a bar serving libations and random places to sit outside the rink floor. Once the evening gets going the floor becomes a slow moving rolling sea of bodies, some of which dressed up in colourful attire. There is no end of wonderful people watching opportunities here. For those with real skating skills, you will find solo roller dancers showing off their funky moves in spaces they can find on the side.
A good evening out with friends, to get your "skate" on, enjoy some people watching, and groove to the music. read more