LicoWomen's Malediven Beach & Pool Shoes

The soles look like they got deep ridges. Is it soft or course material?? (I got sensitive skin even on the underside of my feet :/ )

I already have a pair of these, size 41 and want to replace them. however, i see these are sized in uk sizes. should i order a 7 or 8 for size 41?

Why has size guide changed since last year? purchased size 7 eu 40, 40 on the soles. now trying to reorder, amazon size guide says size 40 is a 6.

Hi. is there is a big margin for adjusting the velcro? mum needs sandals for beach. wide feet. cannot find chiropodic beach sandals. thanks.