The bottle is blow moulded and the cap injection moulded using premium quality Low Density Polyethylene (LDPE). The spout is probably one of the best in the business. It is made from the highest quality German thermoplastic rubber. The unique feature of the spout is that it actually works better the more you use it as opposed to the traditional LDPE spouts that tend to deteriorate with use. All Enigma bottles feature an easy fit screw-on cap.