This is the XCEL 6.5mm Thermoflex Molded Sole Scuba Diving Booties Features: TDC Thermo Dry Celliant Low Pile Fast drying, lightweight, and naturally hydrophobic Glued & Blindstitched Seams The ThermoFlex Molded Sole boot is an ultra-premium dive boot featuring all new TDC Thermo Dry Celliant, a revolutionary inner lining with Smart Fiber Technology that recycles your body heat into infrared energy for greater warmth, increased endurance, faster recovery, and enhanced overall performance. The boot is fully lined with TDC in a low pile infrared print. Its durable molded sole also features toe and heel caps for added protection. The easy/on off ankle zippers feature a glued & blindstitched gusset and a safety tab to keep the zipper slider securely in place.