CrocsWomen's Kadee II Flip W

If I am a standard size 5 which split size do I go for 37/38 or 38/39?

Would you say these are a narrow fit please?

What is the sizing for this?! i am a female uk 6 eu 39 shoe size. should i choose the 5uk men/6 uk women option??

Hi the crocs I have now are size W9 is this a uk 6 or 7?