My boots from Sergio Grasso are the most comfortable I've ever walked/ridden/ran after loose horses/trekked through the mud/cleaned stalls/gone to lunch in! They come in every variety of sizes imaginable. You will not be sorry that you bought these boots. 
 
These boots feature: 
Low boot with calfskin upper
Elasticised leather
Breathable lining
Front zip fastening
Vibram® non-slip sole
Zip and sole in matching colors