Brooks C4 Drysuits: Commercial grade compressed 4 millimeter neoprene... tough, but very flexible. Durable and warm neoprene tuck seals Heavy duty zipper with protective flap. Warm and durable vulcanized rubber arctic boots. Quality Si Tech valves. Heavy duty knee pads Package includes: Hood, gear bag, LP hose, and zipper wax. Options include: Self entry zippers, pockets, latex seals, and many others. Custom sizing and tailoring available. Size X-small thru X-large   Size Chart