Shockproof yes, non-slip no. It's not Kapatos' fault, it's some clever washing machine manufacturers who only put two feet for leveling and nothing more.

Excellent product, you won't find anything better. The material and construction are NOT cheap, and the washing machine stays in place no matter what floor it's on.

In the instant rocking that the washing machine does when it starts to spin, it provides very good damping. It does not move from its position during the spin cycle. It seems to be good.

Quality construction but the result did not impress me. I did not notice a reduction in noise and as for the vibration, I think I observed that the upper part of the washing machine oscillates more intensely. In the end, I took them out again.
If your washing machine has good quality rubber feet (clean them and use a wetex underneath to prevent slipping) and you also do a good alignment, I think you don't need anything else.

I bought them with reservation. They did exactly what they were designed for. They do not slip on tiles and vibrations have been dramatically reduced. Their plastic is flexible and absorbs most vibrations.

It was placed in a washing machine that always used to "take walks" and could be heard throughout the neighborhood. They worked perfectly, the washing machine stays stable. I saw reviews that mentioned they slip on tiles. Personally, I have matte tiles, not the classic glossy ones in the bathroom, I think that's the difference.

It is very good!
I installed them very easily, first by pulling/lifting the washing machine in the front, I put the two back feet and vice versa for the front ones.
The washing machine stabilized perfectly.