Wooden shoes

This is postcard from Netherlands. As you can see, it showed shoes. However it is not normal shoes - it is traditional wooden shoes. 

In the past "klompen" manufactured from poplar tree and were worn by Dutch peasants. Today there are Dutch symbol. Wooden shoes are very interesting souvenir for tourists, but still exist possibility to see the farm guy with this kind of shoes when he drives on his tractor. 

Currently produce approx. 3 millions this shoes by year. There are warmer and more drier from the rubber shoes, so there are wear mostly in the countryside. Shoes, used by Dutch farmers for many years, only recently been approved by EU as shoes – cheap, robust and secure. 

If any one from The Netherlands will be read this - please can you tell me more about this wooden shoes? There are really comfortable or not?:)