It appears frabill changed their line of bibs/parkas. I just exchanged my FXE snowsuit (manufacturing flaw) for an I-4 pair of bibs. Boy are they ever a different product. I put my snowsuit to the test in -22 degree weather, and did not get cold. The original bibs appeared to be built out of much heavier material, intertal leg gators, and zip-down access (for when nature calls).
I have been wearing the new I-4 bibs around the house for an hour and they seem awefully bulky. I am six feet tall and 183 lbs. I feel like I'm swimming in these things. The crotch and leg length seem perfect, but they are wide as heck. Maybe a new design to accomodate layering? Anyone have any first hand reviews or on the ice/water testing?