F-Lite 305 PK GTX Running Shoes are lined with Goretex, making them extremely waterproof. The mesh detailing on the upper also makes these shoes breathable so that the wearer is able to stay cool, dry and comfortable while exercising. The F-Lite 305 PK GTX has a 4 arrow shoc zone, which is the equivalent of a 12mm drop. This means that the wearer receives a high level of comfort and cushioning.