Sorel Womens Out N About Leather Lace Up Rain Boots

I have had to return two pairs of these boots and I've now given up. I ordered a half size up based on reviews and they were too small and then I ordered a full size up and they were way too big! The difference in a half size was massive. I have four other pairs of Sorrel boots and I've never had this problem with other styles. The sizing is just so off! It's a shame.