Our Big Mens USAF Flight and Combat Boots Size 7-13, 14, 15 and 16 meet the United States Air Force Certification Standards. Our Large Size USAF Boots come in Narrow, Regular and up to EEEE - 4E Extra Wide. When it comes to Large USAF Certified Boots for Men, XLfeet is your one-stop solution. Few retailers care enough about Men with Wide and or Big Feet, let alone offer up to size 16 EEEE USAF Boots. At XLfeet, Fitting Extra Large Feet is no Extra Large Feat.