The Thinkpad X250 is portability perfected. It is built for business with the latest Intel 5th generation Core i5 processor and Windows 8.1 Professional. Weighing less than 1.31 kg and measuring 20.3mm at its thickest point, the X250 is ultraportable — without sacrificing anything in terms of ports, connectivity, or durability. Military-specification testing validates the ruggedness, durability, and quality of this laptop by testing against 11 parameters: high pressure, humidity, vibration, high temperature, temperature shock, low pressure (15,000 ft), low temperature, solar radiation, fungus, salt fog, and dust.