MLyzheRss-007 unisex-adult Roller Skate Shoes

The sizes without the eu are those american sizes? i'm a size 9.5 or 10 it goes up to size 41.

I’m a size 5-6 in women’s America, what size do you reccomend I buy?

I’m a size 10 in men in the United States what size should I get?

Are these shoes comfortable to walk in? I want to wear them on campus so I would need to walk in the buildings and occasionally walk on stairs.