5mm thickness for temprate water diving.Rubber sole for added comfort and traction.Zipper and inner gusset for easy on and off.Toe and heel caps and fin retainer.Rugged 5mm NonSkid SoleGusseted ZipperFor temperate conditionsThickness: 5mmSole: Rubber sole for added comfort and traction.Toe and heel caps: YesFin retainer: YesZipper: Gusseted Zipper