CrocsUnisex's Baya Lined Clog

Are the sizes in the list uk 5/7, uk 5/8 & uk 6/7 adult sizes? if so can you tell me the brand sizes on the box please?

Can the inners be removed?

Can you remove the lining for summer?

What is the UK 5 size as notice there's options for men and women then just uk 4 and uk 5