According to the guru, you dont need that many shoe trees, and they only need to be used in the shoes that have just been worn for the day. I have never seen a sandal made like that before, and Im delighted with the total adjustability of them! That is my 3rd buy of this style. This is a good Bluetooth headset for receiving phone calls when driving. Also the bands are tight, so my foot doesn’t go all the end and I hate when a bit of my heels are off the shoe. That was a primary reason I purchased this device, and at this point I’ve given up trying to connect to Sirius. This is a cat-lovers dream power strip. Prompt customer service since I had an issue with the (not included riser). hats of for the product. So you can use your own cable and mic or instal a VModa microphone (why I bought them) or daisy-chain two pairs of these together - so well done for the flexibility.