The Velcro straps are soft and padded, and adjust perfectly with bare feet or socks. I am very displeased with this product. Lots of colors to match my bathing suits. ?????????? There is no base transmitter or batteries for the headset; your controller powers the headset. i have several pairs of crocs and i love to personalize them and give them a little razzle dazzle. The battery life is phenomenal. When pulling one out the box, it was sooooooo light. Well designed, strong and very lightweight. Been walking around today and not had to touch my AirPods once.