These Z/Clouds soles are way firmer and more supportive--so much so that they felt weird on my flat feet. Good stuff . I love these leather sandals by Crocs. These are no different than the others pairs I have had . I began to wear them in at the end of last summer, this led to a lot of blistering on the top of the foot under the white "leather" strap. I used this for my sons headset. Great sound for music when you select the right ear tips - try them all first! I ordered these and it’s pretty easy to install them. These come in full sizes so I suggest ordering down if you dont wear a 1/2 size. Once I slip off and wear back the normal teva flip flops, you can feel the difference.