Shiny Opalo-fabric smock which is produced with the smock 102 as a model.
 
All the seams are double stitched and welded together so you will absolutely not get wet nor will the seams tear. The fabric of this smock is shiny on the outside which makes it very easy to keep them clean - just splash the dirt off with water.
 
This model has tightening string around the hood and wind cuffs in the sleeves. 
 
Manufacturer's product page for the model 102.
 
On the picture, the store owner has the size XS/48 on. He is 171 cm tall and one can see, it is too tight for him :D