for climbing/ running / jumping around. Por ahora me parece una muy buena compra I lets me have more refrigerator storage because its hangs under the sheft with more room to add other foods. I expect Ill have to replace these every year, but they are inexpensive enough that I dont mind. I am in love with how they feel, but I had ordered the black and berry color and received gray and lavender shoes! Package was damaged so I was missing a couple screws but seller was really fast in getting back to me and sending the missing parts. As you can see from the picture, the slot is a little uneven and will smooth it at a later date. HOWEVER, that may have been a fluke because the replacement came the same way but was in perfect condition. Not so wide but sturdy. I think if I buy some rubber grip to glue to the rack, it could help.