The Xcel Axis kids back zip 3/2mm Summer 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 3/2mm Kids Back zip.