RB1 PLUS Fullsuit Men's - The new RB1 Plus is the lightest suit in our line. Less than 3 lbs., it's officially our top of the line, premium suit. Same style and performance features as the iconic RB1 with the added feature of an all new ultra-lite fur, dubbed F3 thermal (FireFlexFabric). Triple glued and blind stitched, with a micro-thin internal seam seal to ensure warmth. Preferred 3.2 Temp- 55-65 degrees Fahrenheit Preferred 4.3 Temp- 51-61 degrees Fahrenheit