Simms G4 Pro Jacket The highest-tech wading jacket on the water, Simms' updated G4 Pro brings a GORE-TEX Pro 3-layer build to the battle and provides a full suite of fishing features for all your on-foot and boat-focused pursuits. Great internal carrying features (reminds us of the Slick Jacket) and super clean design with the latest Gore tech features - a really top of the heap wading jacket!