Decent wellies are god send, go to a decent gun shop that stocks the main three brands, Le Cham, Aigle, Hunter, try them all on, they all fit differently. Neoprene lined are best as they offer good insulation and comfort.
Le Cham are the most comfortable
Aigle are the above but wider fitting
Hunters seem a little heavier
Wellies such as Grubbs etc that have no rubber protection on the upper half around the calfs wear allot quicker than the above mentioned three brands as they wear through eventually or split as all unprotected neoprene does, ask any angler waders have a shelf life. My shooting buddies have went through loads of these types of boots over the years and my original Le Chams are still going strong!
The standard cheapo hunters I think they call "Originals" are not as good as the more modern designed wellies of the three brands above!