O'Neill Women's 2MM Reactor II Back Zip Short Sleeve Spring Suit sz 4, Black and Turquoise wetsuit in great condition! Perfect for chilly surfing days or chilly days on the lake. The O'Neill Women's 2MM Reactor II Back Zip Short Sleeve Spring Suit combines high performance layering and FluidFlex™ material for ultimate warmth that maintains stretch for great flexiblity in and out of the water. 100% Neoprene. Top sleeve / Under sleeve: FluidFlex™. Chest / Back: Mesh Smoothskin fluid foam. Kyrpto Knee Padz for ergonomic knee protection. Smoothskin fluid foam neck. 30% FluidFlex™ / 70% fluid foam. YKK back system. Hidden key pocket. Flatlock stitched seams for breathability. Strategic seamless paddle zones. Back zip.