Not very sturdy but looks nice and had a lot of space so def a good buy The Aux port is an Aux port. A testament to high quality elastic and shoe design. I have figured out a couple of them, but it is a little hard to pick which one you want to press. They are 34 months so i order the size 10 or up to 4 years. There are other products that will just compress your core, and do a better job at it. Comfortable, sturdy grips. This waist trainer is the truth! These leggings are absolutely amazing! ? Not sure about that.