Love these! They are just the right amount of cushion. Memory foam can feel like a rock but these form to your “bottom” nicely and are very comfortable. I like the idea of ties for more stability but I don’t necessarily like the look of bows on the chair backs. The ties on these are long enough to loop back around the chair to avoid the bow look. That being said you could probably get away with not tying them at all as the bottom of the cushions have a very stable textured surface that secures the pad in place and prevents the pad from sliding when you move on/off the chair.  I ordered the navy and they are lovely but are not a true dark navy (more like a dark denim) however they are close enough especially when you consider the chairs are pushed under the table most of the time. These  arrive vacuum packed and are VERY flat until you break the seal. I left mine for 24 hours after opening and they plumped up nicely.