East German Sport and Technology Association GST Winter Cap with FlapsOriginal, vintage cold weather hats from the former German Democratic Republic (DDR). The East German Sport and Technology Association was called the Gesellschaft fr Sport und Technik GST. These feature a unique GST insignia. We are offering 3 options for the GST hats in male and female versions: 1. Gray Wooly material for Males (like the NVA Conscript). These have the full flaps that fold down and secure under the chin. 2. Blue material for Males.