REVIT GORE-TEX POSEIDON TEXTILE JACKET SIZE XL WAS £649.99 NOW ONLY £420! REVIT POSEIDON GORE-TEX TEXTILE JACKET. WAS £649.99 NOW £420.00. REVIT POSEIDON. Think of the Poseidon GTX jacket as the perfect blend between the previous Everest GTX commuter-touring jacket and Defender GTX adventure jacket, with the unsurpassed and improved VCS | aquadefence (EU patent EP 2574249, US Patent US 13/630.520) waterproof on-demand ventilation properties of the Horizon jacket.