Norwegian HEATPAC Overboots, issued to the elite KSK (German special forces). The HEATPAC system was developed by the Norwegian Defense Research Establishment based on Norwegian Army requirements to prevent hypothermia in wet, cold climates.
You don't have to enlist in the services to appreciate the waterproof, thermal qualities offered by these fleece-lined boots. Just throw them over your existing footwear and wallow away in mud, muck and mire. Your feet (and shoes inside) will be dry, clean and protected. After trekking sloppy terrain, just hose 'em off and set 'em outside to dry. No mess. No fuss.