The Bhutan employs Meindls innovative Memory Foam System (MFS). The foam in the upper changes shape to exactly match the shape of the foot. A perfect fit straight out of the box! The Meindl Bhutan MFS now boasts a host of new features including an improved lacing system and more streamlined upper. The addition of memory foam and extra soft ankle cushioning makes them a lot more comfortable. It uses the same last and highly durable Vibram sole unit as its predecessor.