The Xcel Axis kids back zip 4/3mm All Year wetsuit features 100% superstretch Japanese limestone Superprene. It has a plush polypropelene thermo lite internal chest lining for warmth. Glued and blindstitched waterproof seams with internally fusion taped stress points and a watertight back zip. It also adds ankle zips for easier entry/exit. The Axis is our warmest, most flexible 4/3mm Kids Back zip.