TerraRAZ Ninja Toddler & Kids & Adult sizes available! Air-mesh ventilates foot Expanded tech-band stability cradle A-symmetric Velcro closure Recycled dual-density outsole PORON Performance Cushioning Insole Zero-Drop and Barefoot Weight: women's 5.18 OZ, men's 5.6 OZ INSOLE: Aegis Microbe Shield FABRIC: controls odor, staining, deterioration Combined to 2.5mm of PORON Performance Cushioning Foam OUTSOLE: Dual density high abrasion rubber THICKNESS: 3.5 -4 mm YES! This style is VEGAN.