These are a women’s size 10.5 however the website recommends sizing up one half size from your regular size which is why it’s listed as a size 10. These are a men’s size 9 or really 8.5 in standard sizes. They’ve never been worn! They are also water proof. The second pair is listed as a women’s size 11 however the website recommends sizing up one half size from your regular size which is why the box says women 11.5/ men 10