From the manufacturer: The nebula is our highest performance dry top. This 4 season dry top features a cut that gives you a completely unrestricted range of motion making it a perfect option for play boaters and river runners alike. The nebula is constructed from a blend of our exhaust 2.5 and more robust exhaust 3.0 fabrics for the best combination of weight, breathability and abrasion resistance. It features British latex wrist and neck gaskets and a 0.5 mm neoprene adjustable over cuff for durability. It has an extra-long lightweight double tunnel and features our new stealth waistband system for a waterproof seal over your spray skirt.