100% Premium Japanese Yamamoto Limestone Neoprene. 5mm body with 3mm action panels. Full buoyancy flotation front and rear, located to enable movement where needed. Rear buoyancy is double glued & stitched for total protection and durability. Seat and crotch padding is designed in 3 separate layers incorporating a unique mix of evalon foam and neoprene for total protection. 5mm neoprene + 10mm evalon + 5mm neoprene = 20mm total seat protection. Super heavy duty zip slider & zip pocket. All seams double taped.