The Immersion Research Shockwave Spray Skirt is an all around neoprene skirt designed for all kayaking disciplines. It's a good choice for beginner to intermediate whitewater kayakers, or sea kayakers looking to add rolling to their repertoire. Mid weight bungee construction is easy to put on and dry, on a wide variety of cockpit rim profiles, and will stretch to fit a wide variety of boats. 4mm Supratex neoprene deck and casing. 3mm neoprene tunnel. Silicone sticky patches under the casing on each side to help prevent the skirt from slipping in implosion prone areas. All seams are glued, stitched and taped. Mid weight bungee construction is easy to put on.Skirt Fit Chart: Sprayskirt Fit Guide Cockpit and Waist Size Range WhitewaterTouring Minimum Maximum MD Cockpit equivalent size 1.2 1.4 30 x 16.5 32 x 18 LG Cockpit equivalent size 1.7 33 x 18 35 x 19.5 XL Cockpit equivalent size 2.2 36 x 19 37 x 19.5 Tunnel Sizes Minimum Maximum SM Waist 28 31 MD Waist 31 34 LG Waist 34 36 XL Waist 37 39.