These are nice for the price but they will slide all over. I use them under the rack so they are fine for my purpose.Really light and when I unwrapped them the next day they were bowed so I'm thinking I may need to use adhesive to keep them flat? The quart can of paint I put on the top square the next night to keep them flat until installation left a permanent indentation. I just can't recommend this product for anything but light use.The packaging was great, the material is really good and it’s worth your money. We’ve put it down in our garage for our gym and has been working great. Easy to clean and maintain.I purchased these because i have a small apartment so my living room is my gym. I do very active workouts (think P90X) where i have to jump across the room and such. So I got this thinking I wouldn't kill my joints. While i think they're probably Excellent for very stationary things, they slide allover the floor and buckle at the slightest friction. I have to stop my work out at least 4 or 5 times a session to re-connect and adjust them.This is very nice for parents that have hardwood floors wanting to give a room/space for crawling. Super cheap and worth it.