The Epic Series has many of the same ground breaking features as other O'Neill wetsuits including 100% Ultraflex neoprene double seal neck closure LSD (lumbar seamless design) and re-engineered covert blackout zip. :: Boy > Wetsuits. Kid's wetsuitCovert blackout zip: For super easy entrance/exitGBS seams are also taped in all areas of excessive stress for great durabilityThickness: 4/3 mmStrategic seamless paddle zones: An ergonomic. seamless under sleeve panel that allows for unrestricted motionExternal Key pocket with loop: Located along the lower leg inseam. it has been constructed with Fluid Seam WeldStrategic seamless paddle zones: An ergonomic. seamless under sleeve panel that allows for unrestricted motion100% UltraFlex DS neoprene: High-performance super-stretch neoprene with a durable outer skin that resists velcro pullsGlued & Blindstitched Seam Construction: Glued and blind stitched construction provides a waterproof seam and is also tap Double superseal neck: A warm two layer design featuring a 360 degree smooth skin interior lining and a secure lock down Size: 07-8 YRS,09-10 YRS,11-12 YRS,13-14 YRS,15-16 YRS,03-4 YRS.