As someone in a previous review has said, go to the nearest shop and try them on. This is so important for finding a pair of climbing shoes that offer the right combination of comfort and support, not to mention getting the perfect size for your feet. I've just started climbing so I was looking for something which was snug and supporting but also comfortable enough for my feet to still feel fine after an afternoon's climbing at the local indoor centre. I noticed that a previous reviewer said they'd bought a size bigger than their normal shoe size but before I bought these shoes I was asking for advice from staff at the local climbing centre and one of them said that his climbing shoes are 4 sizes smaller than his normal shoe size! As it happens, my normal shoe size is UK7.5 and these climbing shoes are also a 7.5 and feel good. I could probably have squeezed into a size 7 but didn't think I needed to punish my feet this early into my climbing career as i'm not doing anything too technical. All in all i'm really happy with these and look forward to many hours of comfortable climbing.