I just can't get into the Wellies look for wet weather, and here in California Wellies look kind of silly IMO.  These boots fit a niche for me, for rainy, cold days.  I initially took the advice of others to size up, and ordered a 37 (I am US 5.5), but they were way too big.  Went with the 36, and they fit great.  I think the sizing may be mislabeled, since a European 36 is actually a US 6, I believe, not a 5 to 5.5 as labeled on this product.