and I dont know. Il primo impatto con i materiali è stato positivo e lidea della base di ricarica è ottima così lo rende più impermeabile anche se io in piscina o a mare eviterei di indossarlo. Installation like my last one is a snap. Nice set of over ear headphones for the price. I wear the shoes almost daily from April to October/November. So, why consider one of these Samson G-Track Pros? Well, the sound quality is very good. If they could make comfortable every day outside shoes I would buy several pair no matter the price. I have another well known brand and this unit is better. He can slip them on super easy and run outside to play. After a month a piece of a staple started poking through the foot bed and chewed up the bottom of my foot while I was out grocery shopping.