I got them at an amazing price of €7.20! I see that previous customers were not satisfied at all due to their slipperiness on smooth surfaces. Personally, I didn't experience that, although I haven't walked on any slippery surface yet. A great purchase for me...
P.S: Terrible quality... They broke in 3 months... The upper part with the sole got cut on the side. Also, from the beginning, it was putting pressure on the bone of my big toe on the left foot from the outside, causing discomfort. And as for the slipping, if you step on a smooth surface, you will definitely fall!! STAY AWAY FROM SUCH PRODUCTS!!

They slide excessively to the point where you risk getting killed... I have experienced 2 major falls on stairs within a period of less than 2 months... If you only wear them on dirt surfaces or pavement, they are comfortable... If you accidentally step on a smooth surface (marble, tiles, etc.), you're dead

They slide dramatically. They also make an annoying noise when walking. Otherwise, they are lightweight and comfortable, but what can you do...