SperryMen's Sts17471 Boat Shoe

Do you have to ties the laces or are these slip-ons? The pictures are not consistent.

Can these shoes be washed n the washing machine?

Considering buying these from seller 'one nation premium'.. has anyone purchased from them? is it the real Sperry shoe or a knockoff?

What size can I order if in most shoes my number is 38 - 38 1/2 European, in adidas I am 7us?