Manual did not even mention it. Its night and day from my G35s. I wanted these shoes so much. ???? The only thing missing is charging the iPad! Dont get this one. However, this pair is much lighter weight and when worn just to try them on the first time, did not keep my feet warm at all. It took a little patience, but the end result looks great. Mi hijo de 8 normalmente es 1 pero en esta necesita una talla más. After a month things seem to have stayed dry in the boat however is time to reactivate them which I am going to try now for the first time.