Wood raw material production consists of a series phases among tree harvesting and reaches to the wood deport. The logs are usually 4-6 m in height consideration of the condition of forest roads and ease of ground based skidding. The logging activity is a process which is difficult, dangerous, and harmful to the environment and logs. Besides, it is difficult to loading the trucks, moving into storage and stowed away of the logs on the forest roads but much less harmful to the environment and logs. The logging activities are performed by the power of human, animal and machine. And this works carried out 90% of human power because of the terrain conditions and insufficient technology. So, light and heavy logs have generally been skidded on the ground by uncontrolled human power. Ground based skidding by human power can damage to environment, forest workers, work tools and skidded logs. The most important losses consisting of skidded logs are cracking, breaking, splitting and sprawl on the top parts of the logs. Injured parts on the top portions of logs skidded from forest to forest road have been cut. As a result, amount loss of 2% consists of each of the logs. This rate corresponds to the 300 000 m(3) of produced 300 million m(3) logs. The logs in our country are usually skidded by the human power from bottom of the tree to the forest road. This primitive skidding technique is caused important economic losses. The fiberglass caps which are compatible to top portions of the logs, adjustable and portable will eliminate these economic losses. Also, the caps have an important advantage such as less environmental damage.