The 6/5/4mm Mutant offers a split toe design along with enough neoprene to keep your feet toasty throughout the coldest of winters. The boot is 100% sealed using O'Neill exclusive fluid seams and is lined with a firewall interior. The boot features a multidensity thin rubber sole that offers protection without compromising on feel. The Heel pull loop will allow you to get in and out of the boots quickly while the internal split toe offers better balance and will stop the foot from rolling within the mutant boot.rnrnExternal Foxing Seam Weld (100%) SealedrnGlued and Blindstitched SeamsrnIntegrated Top Velcro Closure with Glideskin SealrnForefoot Foxing Support System (Strap-free)rnMultidensity Rubber Sole for Max Feel rnAvailable in Split Toe (ST-3MM) and Internal Split Toe (IST-6/5/4)rnHeel Pull Tabrn