Belleville introduces the newest Marine Expeditionary Footwear - the Belleville Ultralight USMC Combat Boots, also known as the 510 MEF - which is a breakthrough in combat boot technology. Fusing a moccasin-like strobel constructed upper to an ultralight, direct injected PU midsole provides one of the lightest, most flexible, and most durable combat boots on the market. Weighing in at just 20.6 ounces per boot, the 510 MEF is a lightweight boot that also offers toughness and durability no matter the terrain.