FootJoy HydroLite X Waterproof Rain Jacket FJ HydroLite X Golf Rain Jackets are designed for warmer playing conditions with specifically placed knit panels in arms and back for increased movement and flexibility in the golf swing. The HydroLite™ System is a 100% waterproof shell. Combining lightweight fabrics with a bonded liner, makes this performance piece the lightest garment ever produced by FJ. Kiawah Branded.