Does not stack together tightly so everytime you open a box to get a shoe, you will move and disrupt the stack. So, in short, it’s not from overuse that the shield is losing the adhesive. Cant say wether its expensive or not as could not find it in market. This is my third pair of crocs and I’m obsessed I work on my feet 90% of shift at work and these feel so wonderful they feel snug the first time wearing but after that they feel great would not suggest sizing up as they might stretch to much This one will do the job. Edited and given 2 stars for the sellers attempt to rectify the issue. If it wasnt a hassle to return, I would do so in a heart beat. The chains elastic is not waterproof and stretches out very easily And Ill tell ya, going back to the XBONE headset for a few days will really make you appreciate these. Im very very happy with my two audio jacks and I highly recommend them.